excellent customer service! quality inspections!...excellent customer service! and . quality...

Our Goal is FOR ALL STAKEHOLDERS TO HAVE A SUCCESSFUL PROJECT with us and that together we keep people and

structures safe and buildings economically viable to serve the needs of

our community.

We strive for:

EXCELLENT CUSTOMER SERVICE! and QUALITY INSPECTIONS!

January 11th, 2016

OUR NEXT MEETING is February 8th

I. Customer Service Reminder

ll. Consistency Questions

1. I’ve got a group of town homes that didn't have room for meters on each unit. The mains are on each unit. They have gone to one end away from building and built a treated rack (separate structure) to mount the meters on. 3 wire lateral from meter to mains ran approx 50' all installed by EC. They have driven the ground rods for the units at the meter location and have no GE or GEC at the mains at each unit. Is it acceptable to put the GE out at the meters and use this as the only GE for each unit? Townhomes are individually owned units and typically will have their service on each unit as a single family home would. The complications of deeded right of ways for individually owned equipment would tend to prohibit other methods.

2. If I install single yoke 120 volt 15 or 20-amp receptacle in a commercial kitchen on a dedicated branch circuit does it still have to be GFCI protected? Yes. NEC article 210.8(B)(2) requires it. There is no exception in the NEC or NC amendments.

3. The electrical inspector turned me down for running a dedicated branch circuit to catch all of my battery pack emergency and exit lights. He said they needed to be caught from the branch circuit serving the lights in each area. I have always done this and it was approved in plan review. The inspector was correct. Please see NEC 700.12(F)(2)(3)

4. I have a project where the mechanical contractor has installed the Mitsubishi mini-splits. Since the outside units are protected by a OCPD of 40 amps at the panel and the interior units are served from the outside unit, I installed a disconnect with 15 amp fuses for the interior units to meet the nameplate MOCP 15 amps. Now the mechanical contractor says this interferes with the operation of the unit. What are my options for being code compliant and making the mechanical guy happy? Sounds like the mechanical contractor needs to get with Mitsubishi till they are happy and the installation can meet the code.

5. On the same job as the previous question, the mechanical contractor installed 208-volt condensate pumps for the interior units.

These come with a cord and plug but the mechanical contractor cut the plug off and picked up the 208 from the interior unit. My electrical inspector turned this down and said a receptacle should have been installed instead. The mechanical contractor says he does this all over town and has never had issue before. What gives? The inspector was correct. See NEC 110.3(B).

6. Can ENT (smurf tubing ) be installed exposed in a parking deck where not subject to rain or physical damage ? Well maybe. Not enough details of location or intended use are given, see article 362.10 for uses permitted and 362.12 for uses not permitted.

7. My questions concern the location of the utility transformer. a- Does plan review verify compliance with Duke’s guidelines? NO. If shown inside the building, then compliance with NCEC is checked. b- If Duke will not enforce their own guidelines and the transformer is not in the footprint of the building then under what legal authority do I

have to enforce Duke’s standards and would I be going against House Bill 255.

We enforce NCEC 450. The difficulty is the code gives no definitive parameters. NCDOI ruled that per 450 we have to provide the protection needed for the building and its occupants and public. The “Duke Standard” as shown on our website is the result of a study where our department, several local engineers, Duke and others were invited to help us create a safe and consistent policy for enforcement. All utilities serving our area where invited. The enforcement policy was appealed and upheld at the NCBCC. Last year when Duke decided to not agree with the document any longer we discussed the policy with our TAB Committee and the BDC. The TAB Committee stated that if we did anything we should have more restrictive standards as that is what the trend is with IEEE and FM Global. For further background information, please see or website at http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Inspections/trades/Electrical/Pages/Outdoor%20Utility%20Transformer.aspx

http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Inspections/trades/Electrical/Pages/Outdoor%20Utility%20Transformer.aspx



8. Is it permissible to utilize the Shutdown device as prescribed in 445.18(2)(a) as the required disconnecting means of 700.12(B)(6)? NO! Service rating requirements can’t be met that way.

9. Is it permissible to feed a swimming pool control panel from a detached building fed with a 1 phase 3 wire feeder, on a residential property? NO! But there is an Excp. for existing, in a detached building. See 680.25 B 2

10. Sales, storage, or other adjacent rooms to classified areas of dispensing facilities, with doors or other openings, within a classified area, is the entire area of these rooms required to be classified according to the adjacent area? Please explain. The classified area will extend to all those contiguous areas unless other measures are taken. In this case we would recommend an engineer’s proposal showing a positive pressure from the rooms to the classified exterior with interlocks to the dispensers as well as sealing the openings when not opened.

11. What constitutes a RTAP to be performed? Please review our Consistency Policy on the web at http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Links/_layouts/15/WopiFrame.aspx?sourcedoc=/mecklenburg/county/LUESA/CodeEnforcement/Links/Documents/Consistency%20Policy.pdf&action=default 12. I was recently told by the electrical inspector that he could not energize my saw pole on a lot selling Christmas trees until the lights were up and power ran to the shack. Is this a county policy? Below is an old policy which is a good outline but not a requirement. What is installed must meet code and particularly Article 590.

http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Links/_layouts/15/WopiFrame.aspx?sourcedoc=/mecklenburg/county/LUESA/CodeEnforcement/Links/Documents/Consistency%20Policy.pdf&action=default




13. Are panel schedules/circuit directories required to be typed or is ink pen acceptable? Article 110.2, says the marking shall be of sufficient durability to withstand the environment involved. Article 408.4, gives requirements on the description of the circuit. But neither require the schedule/directory to be typed, so legible hand writing in permanent ink, is acceptable.

14. Are Luminaire's in a suspended ceiling required to be fastened by mechanical means to the grid even if independent support is provided? 410.36B

No, this article offers the method of attaching to the grid as being one acceptable means. The county also accepts #9-gauge ceiling wire as a means of support, which was addressed with question #9 of the Oct. 12th Consistency Meeting and in Lay-in Fixtures Revised of the Current Electrical Code Interpretations, on the county’s web-site. Additionally we must remember to follow manufacturers installation requirements.

15. When figuring overload protection for a generator, do you figure at 100% or 125% like a transformer? We don’t figure it. Per UL they have inherent protection as part of the listing.

16. If a single tenant building is allowed 2 services because of different voltage characteristics (480/277 & 208/120), do the mains have to be all inside or all outside or can they be both? Either way would be fine. These services are allowed per 230.2 and are not subject to “special permission”.

17. If a generator feeds a fire pump, how do you figure the OCP at the generator? Some say 125% to 250%, others locked rotor current. Fire pumps may have protection supplied at their listed assembly by the manufacturer. If not arranged in that manner and we must supply it. First 695.4 B 2 a 1 requires locked rotor for the fire pump motor, that’s for an individual source (service). Next a 2 allows for a listed unit. 695.4 B 2 b addresses on site standby generators and requires us to use instantaneous pick up of the full pump room load from a value determined by 430.62 to provide short circuit protection only. 430.62

basically refers us to 430.52. You can use any protection listed in the table for the value, but again it must be short circuit protection only. Instantaneous trip polyphase motors would be sized at 800% of the full load of the pump room loads for short circuit protection.

18. Can standard GFCI protection be used on circuits requiring GFPE protection, such as heat trace (427.22) I think we could agree it would give better protection initially. Eventually the nuisances would be too much though. So, no we need the GFPE as prescribed by code.

19. Does 110.26(C)(1) apply to a 1000 amp busduct with a 400 amp switch? Yes. It applies to all equipment 600v nominal or less.

20. Can I00% of the lighting of the common areas of a hotel be on an emergency generator if it can handle the load capacity and the transfer can switch the load in 10 seconds? Yes, if it can meet the requirements of Article 700 and the NCBC.

21. In a high rise shell core does the core need separation from the tenant space? Yes, per our plans submittal requirements. We are to meet on this and hopefully provide clearer guidelines on separations and options.

22. This is an installation of a new 480v panel with step down transformer, the chain link fence was installed by the GC after the panel was installed. looking at the panel, the distance from the edge of the transformer on the left to the fence is 23 inches. It is my understanding of article.110.26 (2) that the required working width on this installation is 30 inches. The Inspector said that if l would bond the fence and install a piece of plexiglas on the fence that it would be ok. Am l missing an exception that would allow this reduction in working space? I don’t want to be responsible for code violations later if something were to happen.

This would be a clear violation of the required working space of 110.26 A 2.

23. I recently received a failed inspection for a RF at a new nursing facility due to HCF cable being used for branch circuit wiring of the essential system (critical branch). Where is this coming from, it has never been an issue before in all the projects we have worked? The wiring for the essential system must comply with 517.30 C 3 if the Nursing facility has a hospital on site or has hospital facilities per 517.40 B & C.

24. Is it permissible to wire luminaires installed in a patient care area, and the switches are located outside the patient care vicinity, with MC cable, provided the luminaires are above 7-1/2 feet AFF. No. Per 517.13 B 1 3 except. 2 to 3. We would need a raceway rated for grounding. MC isn’t.

25. I am installing hand dryers that are 1490 watts and have a 5/8 hp motor. I installed breaker locks in the panel, but my Inspector says that

the disconnecting means must be within sight of the dryer. Is he correct?

422.31 C Exception allows us to use the breaker (out of sight) as the “other” disconnect if it is accessible and the appliance has a unit switch with a marked off that disconnects all the ungrounded conductors. If not the disconnect means has to be in sight per 422.31 C.

26. Is this adequate for the description required for the TU Application?

This would be allowed only if the whole electrical system for building 5 is complete. This is not what we usually see. There would need to be another application submitted if the original was not correct. We do allow the inspector to make minor changes as noted however.



our community.

We strive for:

EXCELLENT CUSTOMER SERVICE! and QUALITY INSPECTIONS!

February 8th, 2016

OUR NEXT MEETING is March 8th

We’ll have a Selective Coordination Presentation

I. Customer Service Reminder, Hartman

ll. Selective Coordination Policy

Selective OCP Coordination Policy

The National Electrical Code (NEC) requires selective overcurrent studies be conducted on electrical systems where operation of overcurrent devices can cause unwanted and sometimes dangerous outages to emergency and special systems, due to improperly coordinated electrical systems. In plan review these projects are stamped so that the inspector is to receive the report before TCO/CO and spot check the installation for conformance to the design.

Emergency Systems are required to have selective coordination be designed into electrical distribution per NEC 700.27, 701.27, 517.26 and 517.17C. COPS selective coordination is required per NEC 708.54. Elevator coordination is required per NEC 620.62.

These studies by their nature can include large amounts of documentation, and we cannot collect, analyze or

MECKLENBURG COUNTY Land Use and Environmental

Services Agency Code Enforcement

store the completed studies. So as a result we would only require verification that the proper selection study has been performed and made available to the project owner. This can be achieved through a sealed engineer’s letter stating that the study has been;

Conducted on the specified address, under Electrical Permit Number__________

Conducted on the appropriate system per the applicable NEC sections with moderate details

This must be on the design professional’s letter head, affixed with the professional seal and uploaded to the permit prior to TCO/CO.

Below is a suggested template acceptable to Code enforcement.

Your Letterhead

Date

Project Address

Electrical Permit Number

An overcurrent device selective coordination study has been performed on both the normal and alternant source side, at the above location per Article(s)

o Healthcare Fac. 517.17C o Healthcare Fac. 517.26 o Elevators 620.62 o EM Systems 700.10 (B) 5 (b) Exception o EM Systems 700.27 o LR Systems 701.27 o COPS 708.54

of the NEC. Based on that study the required electrical system is found to be selectively coordinated.

Signature and Seal

lll. Consistency Questions

1. When is an ‘IT Room’ subject to Article 645? What if someone wants to put a mini-split system dedicated to a room with computer equipment in it, but wires the room compliant to chapters 1-4. Would it still have to meet the provisions of 645 also?

Per NC Code Policy from NCDOI the room would need to be identified as an IT room by the owner/occupant.

2. If a building has 2 services because of capacity requirements, do the mains have to be grouped or can one be outside and the other inside? If the services qualify by capacity listed in 230.2 C 1 or 2 they can be both in, or both out, or one in and one out. Location is not specified.

3. In calculating the adjustment factors in 310.15(B)(3), when are the neutral conductors counted as a current carrying conductors? 310.15(B)(5) seems a little unclear on some situations. If I have a conduit with 9 120v hot conductors with 9 neutrals. Do I or do I not count these neutrals? What if I were to use 3 hots per neutral conductor? The calculation is based on current carrying conductors. In a 2 wire circuit that is the total load of the circuit. In multiwire circuits that will be only the unbalanced load between the ungrounded

conductors, so that if A carries 12 amps and B carries 9 amps the return is 3 amps. In non linear loads you need to count the neutral as total load.

4. Residential jobs with Non-IC cans. How are we to handle rough inspections where Non-IC cans are installed in areas that would normally be batted or blown insulation? GC says it will have spray foam insulation in the attic rather than insulation in the ceiling joists. Would this require an additional inspection to verify proper clearance around these fixtures after insulation and before drywall? Yes, if the inspector thinks so. There may be closed areas that need to be checked before closing. The inspector needs to advise the contractor of this need and note it on his inspection record. 5. Am I required to use an AFCI breaker on any 2-pole 15 or 20 amp circuits when the Covered Work Policy applies. Example is 15 amp 2-pole on multi-wire circuit for the disposal/dishwasher. Does it apply to 240 volt also or only to 120 volt 15 and 20 amp circuits with or without tie-handles.

The policy is to require the AFCI protection for all covered items as stated.

6. I have the following LED light that can be mounted on ceiling or wall and also can be mounted to 5 or 6" recessed housings. It says flush mount in the literature. If I retrofit an existing recess in a closet, what are my required clearances? It's being used on a recess type fixture so I assume 6" clearance. Or am I going to be required to meet the clearance of a surface mounted fixture being 12"? The fixture is made by WAC Lighting, model FM-306. I have provided a spec sheet as well as the installation instructions. This appears to be a surface mounted light. 12” would be required.

7. Can I install multi-wire branch circuits to serve the emergency lights? No. 700.19 states “The branch circuit serving the emergency lighting and power circuits shall not be part of a multiwire branch circuit.”

8. I have an apartment building, 3 story garden style units, all wood construction. There is no metal water line entering the building so the only grounding electrode system l have is 2 driven ground rods. The building has 4 six pack meter banks located at least 50 feet apart. My question is, what size conductor is required to connect these services together since the only grounding electrode available are the 2 rods to create a common grounding electrode?

Per good engineering large enough to safely conduct the fault current. Per code in 250.66 A, a #6 cu. 9. Can a dimmer be used to satisfy the energy code requirements of 505.2.2.1?

Yes, it would effectively allow for a uniform 50% reduction of all lamps or luminaires as in 1. 10. What are the requirements for temporary utilities? Requirements of system conditions are as set forth in NCEC 10.8. 10.8 Temporary Power 10.8.1 Scope. The provisions of this section apply to the utilization of portions of the wiring system within a building to facilitate construction. 10.8.2 Provisions for Temporary Power. The Code enforcement official shall give permission and issue a permit to energize the electrical service when the provisions of 10.8 and the following requirements have been met: 1) The service wiring and equipment, including the meter socket enclosure, shall be installed, the service wiring terminated, and the service equipment covers installed. 2) The portions of the electrical system that are to be energized shall be complete and physically protected. 3) The grounding electrode system shall be complete. 4) The grounding and the grounded conductors

shall be terminated in the service equipment. 5) At least one receptacle outlet with ground fault circuit interrupter protection for personnel shall be installed with the circuit wiring terminated. 6) The applicable requirements of the North Carolina Electrical Code apply. 10.8.3 Uses Prohibited. In no case shall any portion of the permanent wiring be energized until the portions have been inspected and approved by an electrical Code Enforcement Official. Failure to comply with this section may result in disconnection of power or revocation of permit. 10.8.4 Application for Temporary Power. Application for temporary power shall be made by and in the name of the applicant. The application shall explicitly state the portions of the energized electrical system, mechanical system, or plumbing system for which application is made, and its intended use and duration. 10.8.5 Security and Notification. The applicant shall maintain the energized electrical system or that portion of the building containing the energized electrical system in a secured and locked manner or under constant supervision to exclude unauthorized personnel. The applicant shall alert personnel working in the vicinity of the energized electrical system to its presence.

On our website see; http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Tools/Publications/Documents/Temporary%20Utility%20Service.pdf 11. We had a customer whose 1000 amp main burned out. We replaced the breaker and drew an online permit and called for inspection. The inspector turned us down. We had to move the breaker due to damage on the B leg bus where the original breaker was. We drilled and tapped the buss just as the original was and cut the deadfront in a professional manner. What gives? We’ve replaced many breakers this way in the past without issue. We weren’t even allowed a temporary on this. Per the NCEC all products must be listed and used as listed and labeled. Without information showing that this field alteration could be made the panelboard or switchboard would be considered to be in violation as unlisted equipment. If the factory could come in and their field personnel make a

http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Tools/Publications/Documents/Temporary%20Utility%20Service.pdf



repair and have it field listed, then we could approve the modification.

12. In our electrical consistency info it is stated that boxes must be installed on exterior except when using brick. So many contractors are using the mount blocks and the electricians don't want the box in the wall so the siding guys can remove it if necessary. This has gotten more complicated to enforce due to others using weather proof boxes etc. Does the consistency board of today agree with this ruling or should we alter that to allow no boxes and put the responsibility on the contractor and spot check? This is a consideration that has been back and forth with inspectors and jurisdictions through the years. For most all fixtures a box is required. The issue is when and how does an inspector verify its installation. There really is no difference from brick to another exterior so the committee recommends pulling the policy and leaving it to the inspector to spot check the mounting. For roughs it is sufficient to just leave a cable at the lighting location.

13. Can I use a cord and plug connected condensate pump above a lay in plenum ceiling? What if it's a non-plenum ceiling? Perhaps. If the pump and cord are listed for the purpose it would be fine(110.3B)&(300.22C), most are not though. The NCEC would not allow a cord to penetrate the ceiling or a wall, so the receptacle would need to be installed at the pump (400.7&8). 14. Can a surface mounted range outlet be mounted face up behind the range? There is nowhere I can find in the code that prohibits this. NCEC 406.5 covers the mounting of receptacles. 110.3 B states that we should use equipment per the manufacturer’s instructions. I haven’t seen one that states put the receptacle in a face up position unless it has a cover on it. 406.5 E and F seem to verify this intent. 15. Can I use a window sill outlet face up in window sill as a part of my required small appliance receptacles?

Yes, if it will meet all counter top and small appliance requirements. If face up they should have covers.

16. We have a multi-tenant building that currently has two service troughs with six main service disconnects each. Where there where two tenants at one time it appears someone has opened the demising wall so that there are now two sub panels in this single tenant fed from two different services. We are informing the owner that he needs to make this code compliant by having the mains grouped for that tenant. He of course objects to the cost and does not want this to be done. I can’t directly find this in the code. What is the requirement?

NCEC 230.2 informs us of the services we may have on a building. In this case the existing building services were qualified using 230.2 (B) which requires special permission. As a condition of that permission and in keeping with the spirit of the code in 230.72 we require the service disconnect grouping to be maintained for each tenant. As an

alternative this might be resolved by feeding one sub panel from another provided the loading requirements can be met.

17. I was just turned down because I did not have a dedicated circuit for the vehicle charging receptacles in a detached garage. Where is that in the code?

The turn down was wrong. The charger is an option, not a requirement. A garage requires a receptacle for each vehicle space per 210.52 G 1. If it is a detached garage one circuit is required for the light and general use receptacles.

18. I have a job with both 480 and 120/208. I printed labels to put on each panels that said "480/277V-Brown, Orange, Yellow" and "208/120V-Black, Red, Blue". My Inspector failed me because he said I needed to include the color of the neutral conductor. I've never done that before, what's changed?

NCEC 210.5 C requires identification of ungrounded conductors where you have systems of more than one voltage. 200.6 D requires identification of grounded conductors of different systems and one way is to permanently post it where the conductor originates. 19. I installed an isolated ground receptacle in some Wiremold plastic wireway. Per the job specs, I installed a stainless steel face plate on the receptacle. My Inspector failed me. What's the problem? NCEC 406.6 B requires the faceplate to be grounded. An iso. ground is established for the equipment use only. An equip. grd. is needed. 20. I have isolated ground receptacles being installed in some metal boxes that are hard piped back to the panel, and I pulled an insulated EGC that lands on the ground bar in the panel that feeds the receptacle. The Inspector tells me that I have to pull that ground back to the panel that feeds my

panel because that is the service panel. Is this correct? The isolated ground purpose is to bypass all possible input from other grounding issues feedback. This requires looping through the system to the service panel where the grounding conductor is established. If not completed in this method an isolated grounding conductor is not established. See 250.146 D.

21. Do receptacles within 6’ of dental sinks require GFCI protection, or do they fall under 210.8(B)(5) Exception No. 2? These receptacles are not patient bed receptacles and require GFCI protection. 22. Does a stairwell unit wall heater require a disconnect, or will a breaker lock-off suffice? See NCEC 424.19. More info needed for this unit.

23. When applying NCECC 505.2.2.1 rules on lighting reduction do we take into consideration minimum lighting requirements of Health Dept./Food Services.

We review plans for compliance with the NC Energy Conservation Code. Unless their requirements fit the code we cannot accept them. Inspectors spot check by the plans for compliance with the code. A solution to this may be the use of task lighting as allowed by 505.2.5.3.

24. a. Is it permissible to install PVC within an electrical room of a type 1A structure, if the room provides air exchange to other areas of the structure? b. In a high rise structure? Per NCEC 352.12 PVC shall not be used generally; in hazardous locations, for support of luminaires or other equipment, where subject to damage, where ambient temp. exceeds 122 degrees F, in plenums (300.22), in theaters (520), places of assembly (518) and similar locations.

25. Are coin operated commercial washers and dryers considered vending machines, for the purpose of NEC 422.51?

They do not meet the definition of vending machines in 422.2, so the answer is no.

26. Are rooftop HVAC units fed using LFMC on 20 ampere circuits required to have equipment grounding conductors installed between the disconnect and the unit?

Maybe. The LFMC has to meet all the conditions specified in 250.118 (6).

27. Are panels and other equipment installed in a corrosive area, such as a pool equipment room or a pool chemical storage room, required to be of corrosive resistant construction?

Maybe. Most times an exhaust fan is installed that provide 6 or more changes of air per hour. This results in a non-corrosive atmosphere provided

good housekeeping methods are employed. If this is not specified, we then need to assure all of the system is rated for the corrosive environment per NCEC 110.11 and 300.6.

28. Are assisted living centers classified as dwelling units to apply the branch circuits requirements, covered in 210.8, 210.11, 210.12, 210.18, 210.52, and 210.60? As defined in code a dwelling unit is, A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation. Chapters 1-4 of the code apply to these facilities. If they qualify as Healthcare then additionally requirements and amendments to Chapters 1-4 apply. We would also need to establish where this facility falls in other code definitions. Is it a Nursing Home or a Limited Care Facility (517)? Would it be a dormitory or similar occupancy (210.60)? These sections could also impact the project. As stated in this question it would seem the units are not independent living

facilities. Therefore, the rules in 210 regarding dwellings above would not be enforceable. This appears to be a limited care facility and would need to follow the rules in 517. 29. A GEC for a separately derived system as specified in 250.30 is the structural steel framework sized per 250.66. However, if the steel framework does not qualify as a grounding electrode per 250.52, and can only be used as GEC per 250.64(C) (3), and the only grounding electrode is a driven ground rod, can the connection to the separately derived system grounded conductor be sized as the connection to the ground rods at a #6 cu or #4cu maximum? 250.66 A only requires a #6 for connection to the ground rods. 30. Is it permissible to install raceways between layers of insulation above metal roof decking as specified on a project currently under construction in the county?

Most all things are possible. Many though are impractical, but sometimes necessary. The raceway would need to meet all code requirements and consideration would need to be given to the environmental and ambient concerns. See 300.4 E exception which allows this installation.

31. I noticed that the residential contractors are installing self-contained receptacles in granite back splashes in high end homes. Are they legal to use as counter spacing? Are they allowed to glue them in place with epoxy instead of the 2 screws supplied by the manufacturer?

Per the specs we’ve seen on these units mounting to granite or by glue is unacceptable (110.3 B).

32. Am I required to use a ground wire in 2" flex. I am only told that in Mecklenburg?

Not if you are using it for plumbing. If as an electrical raceway yes in accordance with 250.

33. The NEC requires (300.7) where a conduit passes through areas with different temperatures it must be sealed to eliminate air circulation that causes condensation to occur within the conduit. Recently an inspector failed a freezer installation, that had a run on Carlon passing through the insulated exterior wall. We had sealed the end of the conduit approx. 3 feet from the wall, and he stated the seal should take place at the point of insulation. Is that correct? The seal needs to be inside the conduit at the point of transition.

34. We have HDPE conduit that states it is ETL listed and can be used for boring. Is this acceptable in Mecklenburg County? We did see this product previously and incorrectly approved its use. The manufacturer’s instructions stated it was approved for boring. After further product research it was found the standard of testing used was UL and it does not recognize boring since no testing was performed for this. Currently we could only recognize this product as a

sleeve if it was used for boring. Since our codes and standards are statewide this product should not qualify by code throughout the State.

lV. Haz Loc CE

Our Goal is FOR ALL STAKEHOLDERS TO HAVE

A SUCCESSFUL PROJECT with us and that together we keep people and structures safe

and buildings economically viable to serve the needs of our community.

We strive for: EXCELLENT CUSTOMER SERVICE!

and QUALITY INSPECTIONS!

March 8th, 2017

OUR NEXT MEETING is April 12th

l. Selective Coordination Presentation by

Mike Lang, Principal Field Engineer with Mersen

Selective Coordination An Overview of Selective Coordination NEC Requirements Achieving (Selective) Coordination with fuses Achieving (Selective) Coordination with circuit breakers

ll. Selective Coordination Policy

http://charmeck.org/mecklenburg/county/LUESA/CodeEnforcement/Inspections/trades/Electrical/Documents/Selective%20OCP%20Coordination.pdf

lll. Pools Review

2014 NC Electrical Code on Pools, Hot Tubs & Spas





our community.

We strive for:

EXCELLENT CUSTOMER SERVICE! and

QUALITY INSPECTIONS!

April 12th, 2017 ELECTRICAL CONSISTENCY MEETING

OUR NEXT MEETING is May 10th

l. Customer Service Tips a) Answer the phone; live is best but at least have

a recorded message to let the customer have some expectations.

b) Listen to the customer; listen attentively, we need to understand their needs and expectations to be successful.

c) Focus on the positive; don’t start the conversation negatively, if they do calmly diffuse it and move to a positive. Assure them you are there to help them move forward safely and successfully.

d) If the customer has a complaint, assure them we are interested and will handle it as best and quickly as possible. Involve your support as needed and inform your customer.

e) Always have your mind set on being helpful and accessible. Always be polite and respectful. When the rare case arises and you can’t help them help themselves disengage and inform your manager.


1. Does an ungrounded PV system require a grounding electrode system or interconnection to the premises grounding electrode system? If so, what code references support the requirement?

Yes, a grounding electrode system is required and must be bonded to the ac grounding electrode system. See 690.47(A), (B), and (C), 250.169 (ungrounded system), 250.166 (grounded system)

2. A receptacle outlet is installed in a dwelling kitchen for the refrigerator & is within 6-feet of the kitchen sink. Does the receptacle outlet need to be GFCI protected?

Yes, see 210.8 A 7 of the NEC, but NO per NCEC 210.8 A 7 if it is not serving the countertop (A6).

3. I installed a 20-amp duplex receptacle fed with a 20-amp multi-wire branch circuit. Each half of the duplex receptacle will have a 16-amp load for a total on the duplex of 32 amps. Is each half of the duplex receptacle rated 20 amps, or is the rating for the entire duplex receptacle? The inspector turned me down.

We’re not sure what the turn down was. Per UL 498 each receptacle is rated 20 amps, so that would not be the issue. This complies with

210.21 B, so again no issue. If you complied with 210.4 and 240.15 we don’t see an issue.

4. I was turned down for not having the correct disconnect means for gas dispensers on my job. I had the E stops in and had the neutrals included on the breakers with lockouts for maintenance. What else is needed?

From what info we have in the question it seems you may have neglected to account for the communications, data and video requirements. All disconnect requirements can be found in 514.11 and .13 of the NCEC.

5. I have seen the intersystem bonding block used as a tap for the grounding electrode conductors. Is this listed for that purpose? My understanding is a block is only allowed for services with multiple disconnects and I am not

sure these units are considered bus-bars as 250.64(D)(1) states.

No. The intersystem bonding termination is listed for grounding and bonding, but not as a splice or tap point for grounding electrode conductors. The intersystem bonding termination is for intersystem bonding conductor of “other systems” only. Code Reference: 250.94 and 110.3 B 6. I installed PVC conduits at a dispenser location beside the dispenser base. The inspector turned me down for not being 24” away. I think he was mistaken. The code only requires 24” of cover, not separation. Please clarify. For many years we have interpreted the cover to be required in all directions. Per the NCDOI/OSFM we were incorrect. The cover referred to by the code is only for vertical consideration.

We still strongly recommend that the 24” separation be maintained. PVC will not in itself contain an explosion and it is highly likely that the soil under the dispenser will have a mix of gas and vapors from small leaks over the time of service. This could create an unsafe condition. 7. I installed a surface mounted LED light in a clothes closet. It was 10 inches from the shelf. The inspector turned me down. I thought LED fixtures (luminaires) had the same clearances as fluorescents. What’s required? LED luminaires do not have the same clearances in all cases as fluorescents in clothes closets. LED luminaires must be identified as suitable for installation within the closet storage space to be placed within 300 mm (12 in.) of the storage space. Code Reference: 410.16(A), (B), and (C)

8. As a rule, 4/0 Aluminum can be used for a two hundred amp 3 phase service even though it’s rated for 180 amps, Article 240.3 (3) allows the next larger size overcurrent protection (if less than 800). However, does it still apply to paralleled? Example two sets of 4/0 aluminum to feed a 400-amp service (separate raceways) would total 360 amps, next size up would be 400? Somewhere in the past I was taught when you paralleled you had to meet the full rating, (meaning you’d have to use two sets of 250 Aluminum, for a total of 410 amps). I can’t find that anywhere in the NEC. Am I remembering something that doesn’t exist? Are two sets of 4/0 Aluminum okay for a 400amp service? 240.4 B allows you to use the next standard size overcurrent device in this case (up to 800 amps). Your service would be limited to the load capability of the conductors which would be 360 amps not 400.

9. I have a project very like a recent project completed in another part of the county. At the prior location, we were required to complete an Industrial Machinery Declaration for some equipment there, and it was very cumbersome and confusing. Now at the new project we are being told we must go through the same process all over again. Is this going to have to be done again, this is exhaustive and no one can provide explanation on the process, the state has already ruled this is not needed. The process is as outlined on our web at meckpermit.com. This process was vetted by our attorney for compliance with the General Statutes. If you have difficulty with the process please resource your inspector, electrical supervisor or the electrical CA. The declaration will need to be made to exclude the equipment from our inspection. Per OSHA you still need to comply with having the equipment labeled by one of their recognized testing labs. The declaration we ask for allows you to bypass our

inspection and the enforcement becomes their responsibility and the owner’s liability.

10. Are feeder SER cables installed into the top of meter enclosures located inside building electrical rooms of a multi-family structure required to be enclosed in drywall construction with at least a 15 min fire rating, in 3A and 5A buildings? How about in 1 and 2 type construction? 338.10 B 4 refers us to 334 Part ll for this answer. NFPA and NCBC construction types differ. lll A and V A for NC are NFPA lll and V, type l and ll match. The types do not always directly match. 334.10 (2) allows the cables in multifamily dwellings lll, lV and V construction without enclosure. In other than dwellings cables must be concealed by a finish that has a 15-minute flash rating in lll, lV and V. Type l and ll buildings require the cables to be in raceways.

11. Can a GEC and an EGC be the same conductor, and if so, in what applications would this be compliant? Per 250.121 Exception it could. On the primary of the transformer would be an example. 12. Are equipment grounding conductors required to be increased proportionately if the ungrounded conductors are increased due to ambient temperature de-rating concerns? 250.122 B states that any increase in ungrounded conductors requires a proportional increase in the e.g. conductor.

13. On a single trade permit I have a 1 hr. wall with a low voltage cable through a PVC conduit sleeve and fire caulk installed inside the PVC sleeve. Is this a proper installation and how do we know, or this a Building Inspector concern?

The contractor will need to provide you a UL approved detail for the penetration if it is not shown on the approved plans. This should come from the project designer as a bulletin when plans are required for the project.

14. I have a job with high pile racking. It was originally permitted with no emergency lighting in the aisles. The fixtures are 2x4 LED high bays with individual occupancy sensors. The Electrical Contractor has gone back and installed battery-backup inverters for each fixture that will act as an emergency light. However, the occupancy sensors are still in play, so even in the event of a power outage, the lights do not come on until the Occ sensor is triggered. Is there a reference in the 2011 NEC that prohibits this? What about 2014?

Per NCDOI/OSFM, No. NCEC 700.20, 2012 NCBC 1006.3 & 2701.1

15. I am installing a 2400w 120v Insta hot water heater. I ran #12 wire and put it on a 20A breaker. My Inspector says that I can't fully load the circuit breaker, so I need to install a 25A breaker. Is this correct? I had another Inspector fail me on a similar install where I used #10 wire and a 30A breaker because he said the breaker was too large.

422.10 covers the circuit involved. Per the nameplate 2400w, 120v we have a 20-amp load. Since this unit is not a continuous load your installation was correct.

16. I've been running into several jobs where the contractor is installing a #6 bare copper

wire to the ground rod. Doesn't Mecklenburg require a #4 minimum?

250.66 A allows a #6 and we will also. The issue is being subjected to physical damage. We have accepted an unprotected #4 solid in areas subjected to physical damage.

17. I'm running speaker wires in PVC conduit around a pool deck. My Inspector says I need to have the conduit at least 18" deep. Why? It's only speaker wires.

First let’s recognize that no underground other than what is necessary for pool equipment can be within 5’ of the pool wall (680.10). Your question does not pinpoint your exact location of equipment and conduit(s). No outlets should be within 10’ of the pool wall (680.22 D). If the speakers are for underwater we need to comply with 680.27 A. If the inspector

considered your system as a network powered broadband comm. system, then table 830.47 C would apply. If that was not the case, then 300.5 would apply.

18. Do we require breaker locks for water heaters if the panel is within sight of the water heater?

422.31 does not require a lock when the breaker or switch is in sight.

19. My inspector turned me down for putting 2 wall sconces above the tub area in the master bathroom, she said they cannot be there, was she correct? What if I put them on a GFCI? 410.10 A and D covers these sconces. Their position is the key. They may need to be damp or wet location rated and/or they may violate

other provisions such as chain suspended. Putting them on GFCI is a great idea. 20. Can an under counter wine cooler/mini fridge also be on the kitchen small appliance circuit? Or would 422/440 and or 210.23 apply?

Yes, no, maybe. For example, if the given appliance has a max ocp of 15 amps on the nameplate then no. It must be fused at 15 amps and the required 20-amp small appliance circuit would not work. Make a note on the rough inspection.

21. If I use an AFCI receptacle outlet for my dining receptacles, where should this device be installed if I have hit the kitchen small appl. and then to the dining? Can I put it at the first outlet in the dining where AFCI is required? Or

would it be required to be in the kitchen at the first outlet on the circuit?

As stated in 210.12(A)(4)(c) it would be required at the first outlet on the circuit and must meet all requirements of 210.12(A)(4).

22) Is a zoning permit required to be on site for temporary power?

A zoning permit is not a requirement for temporary power.

23) What is the minimum bonding conductor? What is maximum length?

It depends on the particular application. 800.100(A)(3) allows for 14 AWG, while 810.21(H) allows for 10 AWG. Also, the maximum length is regarding one and two family dwellings, where the bonding conductor

or grounding electrode conductor, shall be as short as practicable, not to exceed 20’ in length.

24) I got questioned by one of our job foremen about ratings on PVC LB’s. We had 2-4” LB’s that we were going to use for 2 parallels of 4-750 aluminums on a riser. He noticed inside the LB is was stamped 3-300MCM max. According to this you can’t even use 4” with 4-500 MCM copper for a 400 amp service anymore. I did some research and all that I could find was in a Mike Holt forum that said once you get over #6 wire, an LB is considered an angle pull box so you would have to have 24” between the conduit entrances. 4” LBs have 15” to 17” between them so that could explain the reduced wire capacity due to bending radius. I just checked a 2” LB and it says 3-3/0 max. If I understand this correctly

the only way to go through a wall now is either to use a vertical trough or a large pull box. Can you tell me how Mecklenburg County’s interprets this please? I have always thought that an LB had the same capacity as the conduit as long as the conductors were not spliced in the LB. I had not seen this wire rating inside of the LB until recently.

Conduit bodies fall under 314.28(2) and (3), in your particular application. The manufacturer is required to mark the max. size conductors per 314.28(3). That section is new to the 2014 NEC. Unfortunately, you are confined to the maximum wire size listed on the conduit body. In most cases the only alternatives are to provide a trough or an oversized LB. In any case we want to be sure we have sufficient wire bending space and do not damage the conductors.

25) Can we partially approve residential projects? That is not our common practice, however it is sometimes allowed with approval from the residential supervisor or manager.

26) Is the neutral service conductor required to be insulated? I was turned down for using a bare aluminum conductor in a PVC nipple between a meter can and a 200A panel feeding a residence. What gives?

The question seems simple but it takes a lot of digging.

Look at 230.22;

Part II. Overhead Service Conductors

230.22 Insulation or Covering. Individual conductors shall be insulated or covered.

Exception: The grounded conductor of a multiconductor cable shall be permitted to be bare.

Look at 230.30;

Part III. Underground Service Conductors

230.30 Installation.

(A) Insulation. Underground service conductors shall be insulated for the applied voltage.

Exception: A grounded conductor shall be permitted to be uninsulated as follows:

(1) Bare copper used in a raceway

(2) Bare copper for direct burial where bare copper is approved for the soil conditions

(3) Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use

(4) Aluminum or copper-clad aluminum without individual insulation or covering where part of a cable assembly identified for underground use in a raceway or for direct burial

Look at 230.41;

Part IV. Service-Entrance Conductors

230.41 Insulation of Service-Entrance Conductors. Service entrance conductors entering or on the exterior of buildings or other structures shall be insulated.

Exception: A grounded conductor shall be permitted to be uninsulated as follows:

(1) Bare copper used in a raceway or part of a service cable assembly

(2) Bare copper for direct burial where bare copper is approved for the soil conditions

(3) Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use

(4) Aluminum or copper-clad aluminum without individual insulation or covering where part of a cable assembly or identified for underground use in a raceway, or for direct burial

(5) Bare conductors used in an auxiliary gutter

Look at 310.106;

Part III. Construction Specifications

310.106 Conductors.

(D) Insulated. Conductors, not specifically permitted elsewhere in this Code to be covered or bare, shall be insulated.

So in this question, a bare conductor is not allowed.

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1) Am I required to use a GFCI breaker on a refrigerator within 6’ of a sink in a commercial breakroom, or will a GFCI receptacle suffice. The refrigerator has wheels and is easily moved.

210.8 B 5 directly addresses this. It requires the GFCI on any receptacle in 6’ of the sink, with two exceptions that do not apply here. If a GFCI receptacle is used for compliance it cannot be behind the refrigerator.

2) I have a unit wall heater in a stairwell. It is a 208 volt single phase unit that draws 14 amps made by Honeywell. The blower motor is 1/8 HP. It has an integral thermostat, but it has no marked-off position. Does this unit require a disconnect within sight, or will a breaker lock-off suffice?

424.19 B 1 allows for the disconnect to be insight of the unit or lockable per 110.25.

3) I wired a rooftop HVAC unit that has an integral breaker disconnect. It also has an integral GFCI receptacle. I was turned down for not having a disconnect on the unit because the receptacle transformer is wired from the line side of the unit’s breaker disconnect. Is this correct?

Technically, by “The King’s English” yes. Let’s look at the big picture though. Is the transformer and receptacle isolated? Is the unit listed? Will it be safe? We are to interpret the code requirements as liberally as possible, so if we can see that its listed, safe and meets the purpose or intent of the code we should pass it. It can’t have the receptacle connected to the load side by code.

4) On a multi-tenant building with mains inside we allow the house panel w/main to be outside. If tenant mains are outside can house panel main be inside a service room accessible from outside or does it require a main grouped with other tenant mains?

We have not made that a policy, but there seems to be no issue either way if the building qualifies for multiple services.

5) In the 2014 NEC article 700.8 requires surge protection for the 700 system. Will the SPD (Surge Protection Device) I installed on the service cover this?

No. 700.8 requires a listed SPD installed on or in ALL emergency switchboards and panelboards.

6) In dwellings that are roughed in for a stackable washer and dryer supplied by a 30 amp, 240-volt circuit, do I have to install a 20 amp 120 volt “laundry” circuit since there is no need for it?

Yes, per 2014 NEC 210. (C)(2) and 210.52(F) at least one 20-amp branch circuit shall be provided and at least 1 receptacle installed.

7) My inspector turned me down for installing LFMC above the ceiling to serve 2 RTU’s. He stated this could not be installed in an air return (plenum) ceiling.

Your inspector was correct. Please see 300.22(C)(1)

8) Is it permissible for a 100-amp breaker and a set of # 1 AWG cu. conductors from one panel to serve a 200 amp sub-panel that has a 85 amp load?

Yes. We can exceed the code at anytime.

9) I have a clothes closet with a box roughed in for the light. The GC installed deeper shelves than I had planned for. Now that we do not have the proper clearance can I blank this box off or would I be forced to remove the wiring?

A blank outlet would be acceptable. Inspectors would need to note that in their inspections. We would suggest that the contractors remove the

outlet or disable the conductor to failsafe the outlet and prevent an accident.

10) Are the receptacles located in a food serving area/serving line portion of a restaurant at the mall required to be GFCI protected?

If we assume this is not a kitchen or not within 6’ of a sink, then we see no requirement for GFCI.

11) If I use metal Romex connectors in a PVC J-box, do I have to ground them?

Yes, per 250.110, so use nm connectors on nm boxes.

12) Is it permissible to protect conductors that have been de-rated for ambient temperature, or voltage drop at the next standard rating of overcurrent devices as detailed in 240.4?

Yes. All requirements must be met per the specific application. The load can’t exceed the demanded ampacity though.

13) I installed a service disconnect for a piece of equipment, the equipment did not have a neutral load and there did not require a grounded conductor. The power company informed me they were installing an ungrounded service. I installed the disconnect and grounded the service to the two grounds I installed, and requested the inspection, and was subsequently failed due to 1. Service is grounded, grounded conductor required, per 250.24C I was acting as told why should I receive the failure, and what right does the inspector have to override the power company? And What are ground fault indicators?

“250.24(C) Grounded Conductor Brought to Service Equipment. Where an ac system operating at 1000 volts or less is grounded at any point, the grounded conductor(s) shall be routed with the ungrounded conductors to each service

disconnecting means and shall be connected to each disconnecting means grounded conductor(s) terminal or bus. A main bonding jumper shall connect the grounded conductor(s) to each service disconnecting means enclosure. The grounded conductor(s) shall be installed in accordance with 250.24(C)(1) through (C)(4).” requires the grounded conductor. The service to the building is regulated by NCEC in this section. Many times, the utility uses a grounded system to deliver an “ungrounded service” in violation of this requirement. If this were an ungrounded system, then there would be a need for indicators and alarms as indicated by NCEC 250.21. These alarms indicate when a phase is in fault.

14) In the question above if there is no required neutral load what is the minimum size grounded conductor required to be brought to the service?

With no grounded load, we in effect are bonding. See 250.102 C 1

15) Is it required to protect the emergency system feeder conductors of a 700 system, using the more restrictive measures listed in 695.6, from the point of origin at the generator, to the point of separation of the separate systems?

Per 695.6 A 2 the special protection is required from the last OCP permitted by 695.4 B or a feeder connected directly to the generator. The code has allowed taps from a trough set up for different systems including the fire pump and for sectionalized switchboards. The key to this question would be in the individual layout of the project.

16) Are weather/rain tight conduit connections required where conduits terminate into the end of a Type 3R raintight auxiliary gutter? If no equipment connections are made to the bottom of the gutter?

If the gutter is exposed to a wet location all connections should be rated for the environment.

17) Does the branch circuit rating for a steam generator used in a residential sauna required to be sized at 125%?

We need to look at the spec. sheet and nameplate from the manufacturer and at 422.10.

18) Is it permissible to wire to cable pendant fixtures using SJOO cord, being fed with 20 amp circuits? What is the minimum size SJOO cord allowed for the installation?

400.7 allows cords to be used for pendant lighting. SJOO has no prohibited provisions and can be rated for 20 amps, a # 12.

19) Per NEC 210.60, in a hotel room is a microwave fastened in place considered permanent cooking equipment? Does a dedicated circuit for a microwave mean it is permanent cooking equipment? If a sink and a fastened in place/dedicated circuit microwave are installed,

does this guest room have to meet the requirements of a dwelling unit?

In Article 100 we are given definitions to use in our understanding of the code. Our first consideration is dwelling unit. Per the code “Dwelling Unit. A single unit, providing complete and independent

living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.” Secondly we look at kitchen in the code, “Kitchen. An area with a sink and permanent provisions for food preparation and cooking.”

Next if we look at the appliance itself per its listing with UL Standards (KQSQ) we see that its title is MICROWAVE COOKING APPLIANCE. “This category covers cooking equipment incorporating one or more microwave generators operating in the normal ISM bands of 915 + or – 25 and 2450 + or - 50 MHz. This equipment includes portable and stationary microwave cooking appliances employing resistive-type heating elements for baking, broiling,

browning, convection cooking, or similar operations. This category also covers combination microwave oven vent-hood fans, and kits for converting counter-top units to built-in, under-cabinet, wallmounted or similar installations.”

Per the plans examiner we have a sink, refrigerator, dishwasher, disposal and a microwave present within these units. Additionally, there will be provisions for a coffee pot and toaster. It seems the total meets the definitions above and we have in fact a kitchen which then qualifies this as a dwelling unit.

In the past we had several times when the question was asked concerning whether or not the microwave was a permanent provision for cooking. In our meetings with the OSFM at code seminars we were informed if the unit had a dedicated circuit or was attached it should be considered permanent.

20) In plan review the last several restaurant projects the design team have taken NEC 220.56 demands for equipment such as hood exhaust fans, make up air fans, hood control circuit, hood lighting, cooler compressor and evaporator, dishwasher exhaust fan, POS circuits, drink station circuits, bar area and bar equipment circuits. What is the definition of “other kitchen equipment”? Does this equipment qualify as other kitchen equipment?

“220.56 Kitchen Equipment — Other Than Dwelling Unit(s). It shall be permissible to calculate the load for commercial electric cooking equipment, dishwasher booster heaters, water heaters, and other kitchen equipment in accordance with Table 220.56. These demand factors shall be applied to all equipment that has either thermostatic control or intermittent use as kitchen equipment. These demand factors shall not apply to space-heating, ventilating, or air-conditioning equipment. However, in no case shall the feeder or service calculated load be less than the sum of the largest two kitchen equipment loads.” So, for the equipment listed in the question;

hood exhaust fans, ventilation - no reduction make up air fans, ventilation – no reduction hood control circuit, ventilation – no reduction dishwasher exhaust fan, ventilation – no reduction hood lighting, lighting – no reduction by 220.56 cooler compressor and evaporator – no reduction

by 220.56 unless in the kitchen POS circuits – as cooler drink station circuits – as cooler bar area and bar equipment circuits – as cooler THE PROVISION IS FOR MAJOR APPLIANCES ONLY as shown in the example list!

21) Is a private RV lot such as a country club RV lot at the lake subject to NEC 551? The definition refers to “the general public”? Yes. The public is the customer of the club through its membership program and deserves the same protections as all others.

22) Do we require GFCI receptacles for all outlets designated for vending machines? What if the machine is on site and has a GFCI attachment plug?

Per 422.51 the units that are cord supplied are to have GFCI as part of the cord assembly if manufactured on or after Jan.1, 2005. If before that the GFCI protection is to be provided. We can only go by what is in place on the project and the time of inspection. 23) I have a service on a strip shop with a trough feeding a house panel and 5 shop mains. The engineer calculated 8,598 AIC on the house panel and a different engineer had 33,300 on the shop mains. How do I deal with this? Bussman has an app that can ballpark this for you. It is Bussman FC2. It can help put you in the correct direction. Both engineers need to be advised of this issue for resolution. We would need a bullentin for any changed values and markings to reflect real conditions. 24. I have an area of rescue assistance system installed in an apartment building. The main unit has an approved NRTL label on it. The other remote

units do not. Am I required to get these field evaluated and labeled?

Maybe not. If the remaining units are just slave units (like speakers) we need no other labels per NCDOI. These units may be built to meet code as well.

25) Does NFPA 72 apply to a single-family home? NO, per the administrative code it does not apply to one and two family, or townhomes. 26)The inspector turned me down for not having a disconnect at the well pump. I have a disconnect at the tank/pressure switch (controller) in the crawl space. Was he correct? If the switch at the pressure tank is lockable it would meet code. See 430.102 B 2. (Per S131 we currently only look at the ocp and wire in the panel for wells.)

27) Can I spray foam a ceiling with IC rated recessed cans up to and enveloping the cans or must I maintain space around the cans?

The only applications we have seen require boxing out around the fixtures or creating a shell of foam away from the fixture. However, if the manufacturer of the IC fixture and the foam insulation do not prohibit the use, we will accept it as in the question. See UL White Book IEZX and NEC 110.3 B and 410.116 Incandescent Recessed Luminaires (IEZX) GENERAL This category covers luminaires intended for installation in recessed cavities in walls, ceilings and similar locations in accordance with Article 410, Parts XI and XII of ANSI/NFPA 70, ‘‘National Electrical Code’’ (NEC). TYPE IC LUMINAIRE — Luminaires marked ‘‘TYPE IC’’ may be installed such that insulation and other combustible materials are in contact with, and over the top of, the luminaire. Type IC luminaires are provided with

thermal protection to deactivate the lamp should the luminaire be mislamped. 110.3 (B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. 410.116 Clearance and Installation. (A) Clearance. (2) Type IC. A recessed luminaire that is identified for contact with insulation, Type IC, shall be permitted to be in contact with combustible materials at recessed parts, points of support, and portions passing through or finishing off the opening in the building structure.

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1) I have a house with metal boxes that are not grounded. The wiring method in the box has an equipment ground. If I replace the devices, do I have to ground the box? It's existing and I am replacing the device like for like. We would need to know what the code allowed at the time of the original installation. If that information is not available, we would require grounding the boxes.

2)On an existing like for like furnace changeout on 2-wire circuit, can I use the old 2-wire with no equipment ground to reconnect my furnace or do I have to run a new circuit with an equipment ground? Or could I use 250.130(C) and the old 2-wire? We would allow the use of 250.130 C as an equipment grounding means. 3)Do I have to bond counterstrike CSST? The manufacturer states that additional bonding is not required, but the Fuel Gas Code in 310.1.1 says ALL CSST shall be bonded. Which one do I follow?

It does not require the additional bonding per NC amendment to FG code 310.1.1 that says "CSST with an arc-resistant jacket listed by an approved agency for installation without the direct bonding, as prescribed in 310.1.1, shall be installed in accordance with Section 310.1 and the manufacturers installation instructions".

4)What is required to utilize LFMC or FMC as raceways for service conductors, I recently had a service that was installed using UG PVC and changed to LFMC above the floor and ran up into the service enclosure and was failed due to the inability to bond the LFMC connector at the PVC changeover? The service raceway needs to be bonded by appropriate fittings per 250.92 B

5) On a townhouse where two services are set side by side, do the ground rods for each service have to be at least 6' from the ground rods of the adjacent service?

These should be 2 different services and buildings; the code addresses this issue in 250.53 B. The better application would be to have them more than 8’ apart. 6) We are installing new services in cell towers to supply new equipment cabinets. We were recently turned down for not providing a service receptacle per 210.64. If there is a receptacle inside the equipment cabinet, will that count? The cabinet is locked, but technicians working on it will have a key. The outlet is required per 210.64. In the 2017 Code, he requirement is extensively revised. We will allow the above for compliance.

7) Does 408.4(B), Source of supply labeling for panelboards, apply to apartments? Yes, source of supply is to be marked. 8)I have two services on a building. Can I use the building steel (in contact with earth and concrete encasement) to form the common grounding electrode required by NEC 250.58?

Yes, IF INSPECTED. AND PER 250.68 C IT CAN BE THE GROUNDING ELECTRODE CONDUCTOR. Even when high and dry!!! For connections see 250.70.

9)I was recently turned down on a saw service inspection for two defects, but only one I have a question about. We installed a single ground rod for the saw service. The inspector said because this was on a commercial job site, two ground rods are needed. Are two driven ground rods required based on whether the saw service is residential or commercial? NCEC 250.53 A 2 requires a rod electrode to be supplemented. Per the NCEC generally, if one ground rod is used we need a certified test showing a resistance of 25 ohms or less resistance to earth. AMENDMENT 250.53(A)(2) 250.53 (A) (2) Exception No. 1: If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25

ohms or less, the supplemental electrode shall not be required. For a saw service on one and two family dwellings 150 volts and 100 amps or less we have an exception, but not for commercial. Exception No. 2: The supplemental ground electrode shall not be required at temporary electrical service installation (saw service pole) at a construction site for one and two-family residences, provided the temporary electrical service does not exceed 150 volts to ground or 100A. 10)Can you run a temporary feeder from a saw service to a small job trailer, and the service still be considered a saw service, or does this then become a pole service. It is still a temporary construction service either way. We do consider this part of the saw service if not attached to the temporary power building service.

11)I have a four unit apartment building. Each apartment has five baseboard heaters totaling 6800w and no air conditioning. Each is 675 sq. ft., with a 12kw range 540va range hood and 1400va refrigerator.

When using 220.84 to calculate the service size in this instance, would I derate the baseboard heat per 220.82(c) before applying Table 220.84? My Inspector says no, but my Continuing Ed Instructor says yes.

.82(c) is for a single dwelling, .84 is for multifamily. The two do not interact. The instructor had a bad moment.

12)I must replace some aluminum rated receptacles. If I replace them with the same type, do they have to be tamper resistant? Does the circuit need AFCI?

They must comply with 406.4 D of the NCEC. They would require AFCI and TR as required in locations by current code.

13)I have a well, ditch was covered. Do I need to look at this? Do I worry about OCP, etc. Is the Health department really checking this?

Per S131 we do not permit wells. As part of our panel inspection we will look at ocp for wire size and eq. grd.

14)Is an intersystem bond bar required when replacing an existing residential service? Could I just connect the other utility grounds to the main ground bar inside the panel?

Per NCDOI it is not required. Typically, we see the old systems being connected to the exterior GEC. We would not recommend the connection inside the panel due to the lack of training of the installers of these systems.

15)Is the Metal covered flexible duct allowed to be in contact with an IC rated can light?

Per the UL Whitebook; “TYPE IC LUMINAIRE — Luminaires marked ‘‘TYPE IC’’ may be installed such that insulation and other combustible materials are in contact with, and over the top of, the luminaire.” The light does not care but the duct may have limitations.

16) Can a saw service be attached to a permanent structure, such as an existing house?

A saw service is for construction and is not allowed to be attached to the structure being built or rebuilt.

17) What is the float switch on a pier service or subpanel for the floating section of the pier?

Most likely you are referring to the signal needed to disconnect the service to comply with 682.11.

18) If we use pulling C’s above a sheetrock ceiling, will these have to be accessible?

Yes, per 314.29

19) I had an inspector tell me that EMT could not be used as an equipment ground conductor anymore. Is this true?

This statement was incorrect. Electrical Metallic Tubing is permitted to be the equipment grounding conductor per 250.118(4) and 358.60

20) If an electrical room has an 800 amp or greater busduct but only a 200 amp OCPD installed, would the electrical room door have to swing out and have panic hardware?

Per 110.26 C 3 it will.

21) If I have water piping crossing above a transformer ‘s dedicated electrical space does it have to be panned?

Per 110.26 E it would if a panelboard. Transformer not on the list.

Be aware that 110.34 F does not allow the systems over the dedicated space.

22) What size ground is required for grounding of a data rack?

The largest circuit used for power at the unit feed and based on 250.122.

23) In a recent consistency meeting about #6 GEC going to a ground rod that was subject to physical damage would need to be increased to a minimum #4 solid. Where does the “solid “conductor requirement come from?

250.64 B states a #4 or larger shall be protected if exposed to physical damage. Our policy has

allowed a #4 solid to run down the exterior wall and underground to the driven ground without protection.

24) Why is it that on my rough inspection that I must have joints made up on boxes that contain more than 2- 2 wire nm cables?

All joints to be made must be inspected while accessible. In this case the equipment grounds would need to be tailed out if this is a receptacle and the neutrals as well if it is a switch without a neutral connection. The idea is to allow for the connections allowed to the least rated devices on the market.

25) Can I run 12-2 romex from a pool panel in an apartment clubhouse through the attic to an outside junction box and then UF cable to a deck box, an insulated ground from deck box to the wet-niche light? No, because 680.23 (F) (1) and (2) requires an insulated copper equipment grounding conductor

to be run with the branch circuit conductors from the source of the branch circuit to the wet-niche light. The equipment grounding conductor shall be sized in accordance with 250.122, but not smaller than 12 AWG. 26)Are we accepting romex from the pool panel in an apartment clubhouse to the pool motor disconnect? No, because 680.21 (A) (1) requires an insulated copper equipment grounding conductor sized in accordance with 250.122, but not smaller than 12 AWG. However, as a point of interest, in one-family dwellings, in the interior of the dwelling units, or in the interior of accessory buildings associated with the dwelling units, any of the wiring methods recognized in Chapter 3 of this Code, that comply with the provisions of this section, shall be approved. Where in a cable assembly, the equipment grounding conductor shall be permitted to be uninsulated, but it shall be enclosed within the outer sheath of the cable assembly.

27) In a commercial establishment, is a mop sink in the floor considered a "sink" for the purposes of GFCI protection?

Yes, a sink is a sink (water and basin and drain).

28) Are notes on drawings enforceable if they exceed code? Ex.-a note requiring 10ft ground rods--#10 conductors on 20a. Circuit over 100ft—requiring all 20a. Circuits on apartments general lighting circuits

As CEOs, we can only require code. If the plans/specs. exceed the code and are not met we need to advise the owner’s rep and note it.

29) Can a main bond jumper be paralleled? Ex. (2) 3/0 instead of 300kcmil

NO.

250.102 has no permission for parallel jumpers. 310.10 H does not list main bonding jumper.

30) What are requirements for redundant wiring areas in a chiropractor’s office designated for patient care or exam? Reference NEC 517.13, 250.118 and 517 definitions.

“Patient Care Space. Space within a health care facility wherein patients are intended to be examined or treated. Informational Note No. 1: The governing body of the facility designates patient care space in accordance with the type of patient care anticipated and with the definitions of the area classification. Patient Care Vicinity. A space, within a location intended for the examination and treatment of patients, extending 1.8 m (6 ft) beyond the normal location of the patient bed, chair, table, treadmill, or other device that supports the patient during examination and treatment and extending vertically to 2.3 m (7 ft 6 in.) above the floor. [99:3.3.139]”

517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas. Wiring in patient care areas shall comply with 517.13(A) and (B).

(A) Wiring Methods. All branch circuits serving patient care areas shall be provided with an effective ground-fault current path by installation in a metal raceway system, or a cable having a metallic armor or sheath assembly. The metal raceway system, or metallic cable armor, or sheath assembly shall itself qualify as an equipment grounding conductor in accordance with 250.118. (B) Insulated Equipment Grounding Conductor. (1) General. The following shall be directly connected to an insulated copper equipment grounding conductor that is installed with the branch circuit conductors in the wiring methods as provided in 517.13(A). (1) The grounding terminals of all receptacles. (2) Metal boxes and enclosures containing receptacles. (3) All non–current-carrying conductive surfaces of fixed electrical equipment likely to become energized that are subject to personal contact, operating at over 100 volts. Exception: An insulated equipment bonding jumper that directly connects to the equipment grounding conductor is permitted to connect the box and receptacle(s) to the equipment grounding conductor.

Exception No. 1 to (3): Metal faceplates shall be permitted to be connected to the equipment grounding conductor by means of a metal mounting screw(s) securing the faceplate to a grounded outlet box or grounded wiring device. Exception No. 2 to (3): Luminaires more than 2.3 m (71⁄2 ft) above the floor and switches located outside of the patient care vicinity shall be permitted to be connected to an equipment grounding return path complying with 517.13(A).

31) Is it permissible to install open conductors ran across the floor of 277/480 volt branch circuit, without installation in cable tray or raceway, under a raised equipment room floor? No. See 645.5 E or Chapter 3. 32) Is NM cable approved for installation above a drywall ceiling, in a Type I or II structure? What if it is enclosed within a raceway? Unenclosed by raceway, no. In a raceway, yes. See 334.10 (5)

33) In what circumstance is it permissible to terminate the GEC in the service equipment to the Equipment Grounding Bar? When they are bonded to the common GEC system. 34) Is it permissible to connect power to office partitions using multi-wire branch circuits? Yes, they just need to be on common trip breakers or approved tie handles. See 210.4 B and 240.15. 35) Is the interior of the masonry voids in exterior walls considered a “damp location”? No, see 334.10 A 2

36) Can a set of 500mcm from a 400 breaker be terminated to the line side of a 200A Disconnect. I believe the line side of the disconnect determines the size it should be rated at and fused @200A. The code is vague to me; can anyone tell me if this is acceptable?

We would need to apply a 240.21 tap rule for this application.

37) Are anti-short bushings required for both Type AC and Type MC cable terminations?

See manufacturer installation requirements. 320.40 requires it for AC.

lll. HAZ LOC, Part 6

Our Goal is for all stakeholders to have a successful project and, together, we keep people and structures safe and buildings economically viable to serve the needs of our community.



Electrical Consistency Meeting, 8 a.m., July 12 at 2145 Suttle Avenue, Pine/Fir Conference Room.

Our Next Meeting is August 9th

Mr. Stephen Frank, CQA, Lead Field Engineer from the Research Triangle Park office of UL, provided an overview of UL, covering such topics as the product spec (replaced the white book), UL’s regulatory website, UL’s marks, CE marks, field evaluations modifications, etc.

Our Goal is FOR ALL

STAKEHOLDERS TO HAVE A SUCCESSFUL PROJECT with us and

that together we keep people and structures safe and buildings

economically viable to serve the needs of our community.

We strive for:



August 9th, 2017 ELECTRICAL CONSISTENCY MEETING

OUR NEXT MEETING is Sept. 13th

Our October meeting is split for our CODE CHANGE CLASSES

Plan to attend either October 4th or 24th

Please email [email protected] with your planned date of attendance

Classes are scheduled for 8 hours and provide CE credits

mailto:[email protected]

l. Customer Service Tips, Rains

ll. Q and As

1. If the dining receptacles are wired off the kitchen small appliance circuit and they are already GFCI protected, am I still required to AFCI protect them?

Yes. 210.8, 210.12 and 210.52 all apply in this situation. They all are separate code sections that all must be used and applied to the portions designated by their specific code requirements. The dining does not have to be GFCI protected under normal circumstances, but GFCI cannot be used in place of the AFCI in 210.12 and 210.52 requires the 20-amp small appliance circuit for dining rooms and nooks.

2. Can I use a two-gang nail-up on the ceiling for hanging a light fixture? No, per 410.36 and 314.27(A)(2).

3. My inspector turned me down for terminating my GEC on the equipment grounding bar in the

service panel. He said I had to terminate it at the Grounded service neutral unless I used 250.24(A)(4). Was he correct? Maybe. The service panel typically has the e.g. bar and the neutral bar connected through either a factory bus or factory supplied bonding jumper. Either would meet the requirement of code including the specified section. The bonding jumper to the service can should not be confused with the ones mentioned above as the can is not allowed for the g.e.c. fault current path.

4. When feeding pole lights and I have increased

my conductors to #8 w/ #10 ground, I know per 250.122(B) I must increase proportionately. But, if I were to put it on a 50-amp breaker through my building to a fused disconnect and step my conductors down to #10 on 20 amp fuses, would this be permissible? I don't see a code issue. I have protected my conductors per article 240 through the building and for the #10 after the fused disconnect.

It seems your application of code is applying rules for overcurrent protection in lieu of rules for voltage drop. It may work depending on exact conditions. We would need more information of exact application to thoroughly answer this question. Per Code the installation will pass.

5. I am doing low-voltage wiring for HVAC

controls. I secured some of my cables to the strapping supporting the ductwork with cable ties and tape. My Inspector failed me citing 800.24. Am I wrong in how I've done my work?

Per the question, it would seem the code needed to comply with is 725.24, not 800.24. The requirement is for the cable to be supported by the structure, not the ductwork or other systems.

6. Are we required to identify our support wires

for light fixtures? 300.11 doesn't mention luminaires and 410.36 doesn't say that the supports need to be identified.

The specific word is not in 300.11 as stated. However, it is implied in the exception (equipment). We would require the identification. This would be a great place for a code change. We all realize that a fire rated assembly is a life safety issue and should be highly scrutinized for safety performance and protection. The reason for tagging is to let others be aware that this is a part of a LS rated system. These systems are defined and regulated in our Building Code, and in UL and ASTM Standards.

7. In a 3-hour fire wall I ran a PVC conduit and

changed over to EMT before we stubbed out and fire caulked the penetration. The Building Inspector said we can't do that because of the dissimilar materials, but I believe that it's been done that way for many years. Please clarify.

Per normal procedure we would be looking for a detail shown on the approved plans of the detail for the penetration. As an alternate the inspector may elect to accept a detail from UL standards. Any other solution would need to be

submitted to the Building CA as an alternate means and methods.

8. I have a swimming pool installation with

multiple pools all tied into a common pump and filtration system. The approved drawings from the Engineer show the equipotential bond around each pool, and interconnecting with each other and the pump equipment. However, he has extended the bond wire to the MDP for the building and bonded it with the service at that point.

I don't think this is correct, and the Soares manual indicates that it is incorrect, but the Electrical Contractor has installed it per the drawings and wants me to provide the Code reference prohibiting this installation. I have not been able to find in the Code where it is prohibited to land the Equipotential bond to the EGC in the supply panel. Per 680.26 the code has several requirements for establishing an equipotential plane for

equipment, metal and surfaces around a pool. It also states that it is not required to extend this system to panelboards, services or GEC systems. Several jurisdictions have allowed and even required this though. It does not meet the intent of the code and could lead to providing erroneous electrical charges to the pool system which should be avoided. Further proof of this is available in the 2017 NEC where the code prohibits the use of the pool bonding system as a grounding electrode in 250.52 (8) (B) 3.

9. Are 15 and 20-amp single phase 125-volt receptacles installed in food prep/serving areas, in R1, R4, and I-2 occupancies required to be protected on GFCI? What if a sink is present in the food prep area?

First, we need to consider our definitions per the code. We need to determine if 210.8 A or B applies. Dwelling, Multifamily. A building that contains three or more dwelling units.

Dwelling Unit. A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation. Then we need to recognize that R1 are residential occupancies containing sleeping units where occupants are primarily transient in nature and include hotels/motels/boarding houses. R4 is residential care/assisted living facilities that provide accommodations in a residence occupied as a home by the caregiver for persons of any age for less than 24 hours, restricted to more than five but less than 16 clients. I-2 is an occupancy for medical, surgical, psychiatric, nursing or custodial care for those uncappable of caring for their selves and include; hospitals, mental hospitals, nursing homes, detox facilities, child care facilities. R1 was covered in our May 10th meeting. Normally they may use the requirements of 201.8 B for hotels and Motels but if they qualify as dwellings they need to meet 210.8 A. Boarding

houses could be a combination of both depending on layout, locations, and use. R4 would typically fall into the same category as any SF residence, 210.8 A. I-2 would need to meet the requirements of 210.8 B

10. In the drawing is it permissible to use the

bathroom circuit to feed all the receptacle outlets and the utilization equipment as indicated, in a R2 Occupancy?

An R2 is defined as occupancies containing sleeping units or more than two dwelling units where occupants are primarily permanent in nature, including: apartment houses, boarding houses, convents, dormitories, fraternities, sororities, hotels, live/work units, monasteries, motels, vacation timeshare properties.

Since it is unspecified in the question we are going to assume the question relates to an apartment. In that case 210.11 would apply and (C) (3) exception would allow the wiring as shown

in our judgement considering the “dressing” area as part of the bath. We would consider the additional circuit for lighting to be above the code requirement.

11. Can a low voltage (300V rated cable) for a lighting control class 2 circuit, be installed in the same raceway, as a 277V circuit with 600V rated insulation?

No, per 725.136 of the NEC. 725.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Network-Powered Broadband Communications Cables. (A) General. Cables and conductors of Class 2 and Class 3 circuits shall not be placed in any cable, cable tray, compartment, enclosure, manhole, outlet box, device box, raceway, or similar fitting with conductors of electric light, power, Class 1, non–power-limited fire alarm circuits, and medium-power network-powered broadband communications circuits unless permitted by 725.136(B) through (I). (B) Separated by Barriers. Class 2 and Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, non–power-limited fire alarm and medium power

network-powered broadband communications circuits where they are separated by a barrier. (C) Raceways Within Enclosures. In enclosures, Class 2 and Class 3 circuits shall be permitted to be installed in a raceway to separate them from Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuits. 12. Can I reduce the size of my grounded conductor on the supply side of my service? What if my drawings specify a size, may I still reduce?

Article 230.42(C), states that the minimum size of the grounded conductor shall be sized per 250.24(C), which refers you to table 250.102(C) (1). Also, you must keep in mind the requirements of 220.61. If a reduction is made in the field on the size of the grounded conductor on the supply side of the service, you will be required to provide a letter from the engineer, showing that the reduced conductor size, still meeting the minimum requirements of the code.

13. There is a wastewater pump behind the building. To provide protection from physical damage, I mounted a PVC J-Box to the top of the tank and ran 4' of 2” LMFC to a metal junction box on the wall. I fished the 3 factory attached cables to the junction box on the wall. Inside the metal junction box on the wall, I installed a handy box and a single receptacle device, where I plugged in the pump float plug, and then the pump into that. My inspector turned me down stating cords may not be installed in raceways per NEC 400.14 and 430.107 since the motor disconnect wasn't readily accessible. I have done this before and never been turned down.

There are several areas of concern when dealing with this question. First, what is wastewater? Secondly would this be a classified area and need to comply with NFPA 820 and necessary parts of NEC 500, 501, etc… Then we could be concerned with appropriate wiring methods. More information is needed.

14. I wired an AC unit MCA 22.9 max fuse 40 amps.

I used # 12 wire and fused it at 30 amps. I was turned down. The inspector said the wire was only good for 20 amps. Other inspectors have let me fuse # 12 at 25 amps. Who’s, right?

To determine the answer, more information regarding the conductors is needed. You would need to provide the type of wire, copper or aluminum, also the insulation type and the temperature rating of the termination points. For example, let’s say you have #12 copper THWN and your lugs are rated at 75 degrees C. Article 440.6 allows you to size your circuit conductors and overcurrent protection, by the manufacturer’s nameplate rating. The minimum circuit amps given by the nameplate is 22.9 amps, so the conductors would be sized correctly because 310.15(B) (16) gives a max. rating of 25amps to the conductors. The proper fuse size, depends on the type of fuses and start-up requirements, but the amperage would be determined from a minimum of 22.9 amps to a maximum of 40 amps.

15. How many corners of a 2 x 2 light are required

to be tied to structure? Caddy corner or all 4?

See Code Interpretation, Lay-in Fixtures, on the Mecklenburg County Website:

16. A restaurant request a final, while verifying OCP

and 3rd party listing during the inspection the manufacturer in their installation book references the equipment to be on an equal potential bond.

Would this be enforceable? There is an external grounding point supplied.

The NEC does not require an equipotential bonding connection between appliances. However, per NEC 110.3 B, if the manufacturer requires it, it must be installed per the manufacturer’s instructions and be protected against physical damage.

17. If I have installed a Ufer ground, and have

record of the inspection am I still required to install 2 ground rods? No, per 250.53

18. I recently failed an inspection because I installed an insulated Grounding Electrode Conductor, that was black, and was told it must be green. Is it permissible to install an insulated black Grounding Electrode Conductor?

Yes. There is no color specified as there is for grounded or grounding conductors.

19. Are 4x4 boxes with clamps rated for use with Hospital Grade MC cable?

Possibly. While we have not seen them. If there are those listed for the purpose, we would accept them.

20. NEC 230.2(c)(1) allows a 2nd service when capacity requirements are over 2000 amps. Is this based on connected load or diversified load totals?

Ex. Srv #1 Srv #2

connected 1095 1100 = 2195 amps

diversified 885 1000 = 1885 amps

The allowance is based on the calculated load per the code.

21. Does a psychiatric clinic for consultation only need to meet requirements of NEC 517?

Normally consultation would not indicate patient care as defined in the code. Always it

depends on the treatment involved. If it meets the description of patient care in 517, yes. We would accept a letter from the state authority over the psychiatric practice as a determination.

22. Code allows branch circuit overcurrent devices in guest rooms and suites without cooking equipment to be accessible only to authorized personnel (NEC 240.24(B)(1)(2)). Does this apply to a multi-occupancy building where all panels are secure with in the landlord/owner’s suite? What if the building has on site property management?

240.24 (B) (1) allows both MO and guest room and suites per the stated conditions in code.

“(B) Occupancy. Each occupant shall have ready access to all overcurrent devices protecting the conductors supplying that occupancy, unless otherwise permitted in 240.24(B)(1) and (B)(2). (1) Service and Feeder Overcurrent Devices. Where

electric service and electrical maintenance are provided by the building management and where these are under continuous building management supervision, the service overcurrent devices and feeder overcurrent devices supplying more than one occupancy shall be permitted to be accessible only to authorized management personnel in the following:

(1) Multiple-occupancy buildings (2) Guest rooms or guest suites” We will need a letter from the owner stating how they comply with this and denoting who their qualified electrical maintenance company or personnel are and what qualifies them.

23. Is it permissible to apply the demand factors of

Table 220.56 for refrigerators, freezers, booster heaters and other kitchen type equipment located in breakrooms, hospital labs and other areas outside of the kitchen? No. The allowance is for Kitchen Equipment. If it is located beyond the kitchen we will not qualify it.

lll. Code Update The 2018 NC Building Code as presented on the NC DOI website, has been adopted by the Building Code Council at the June 2017 quarterly meeting. It is presently pending Rules Review. The review may not be completed until September, so we cannot promise there will not be some minor changes, but to date there are no anticipated issues with the timeline discussed in the previous Engineering Newsletter. The 2018 NC Code (Except Electrical) will become adopted no later than July 1, 2018, and then we enter into a (minimum) six month overlap timeframe where either the 2012 NC code or the 2018 is acceptable. Then, on January 1, 2019 the 2018 NC code is effective, and the 2018 NC Code is the requirement. This time frame of overlap may be extended, but that cannot be predicted at this time. The 2018 Electrical Code will become effective April 1, 2018. Remember, the newly adopted 2018 NC Building Code, once it clears Rules Review, is like any other code amendment and can be used as an alternate

method prior to the effective date if requested by the user. Reference NC Administrative Code Section 102.5. BE SAFE AND ALWAYS REMEMBER -

Our Goal is FOR ALL

STAKEHOLDERS TO HAVE A SUCCESSFUL PROJECT with us and

that together we keep people and structures safe and buildings

economically viable to serve the needs of our community.



September 13th, 2017 ELECTRICAL CONSISTENCY MEETING

Our October meeting is split for our CODE CHANGE CLASSES

Plan to attend either October 4th or 24th,

7:30 am registration. Please email [email protected] with your

planned date of attendance for reserving your seat.

Classes are scheduled for 8 hours and provide CE credits

mailto:[email protected]


ll. Q and As

1. If I install a disconnect within sight of a VAV that contains duct heaters, so as not to be “serviced while energized”, would this alleviate the requirements of 424.66(B)? No. The requirement for providing working space is still applicable in 110.26. 110.26A allows an adjustment to the minimum distances of A1, 2, or 3 based on the condition of not being energized. 424.66(B) provides no allowance for reduction.

2. The inspector turned me down for using

duct seal to seal my service raceways as required by 230.8. He said it was not identified for use with the conductor insulation. What gives? I got the idea straight out of the NEC handbook.

While duct seal may be acceptable in some locations it may not be in others. Per NCGS 66.23-27 all electrical products need to be listed. Per NEC 110.3 B the product must be used per the manufacturer’s instructions. If this installation were just for condensation concerns I would judge the duct seal to be appropriate. If it was for weatherproof or water control I would turn it down. More concise info is needed for this question.

3. My customer wants to install the bathroom

receptacles inside a cabinet that sets on top of the countertop. These will still be within 3 feet of the sink but only accessible by opening the cabinet door. Would this be allowed? No, not as the required outlet. Inside the cabinet would not meet the requirements in 210.52 (D) of the code.

4. Are PVC raceways for (data and phone) installed under a commercial parking lot required to be a minimum 24” deep? These would qualify under Article 800. Per 90.3 of the NEC Chapter 8 stands alone. No depth is provided.

5. I am doing a tenant unfit at a strip mall.

The inspector is requiring receptacles for the storefront windows. Do I have to install these? They are not shown on the plans and the owner has no use for them. Per NEC Definition, Show Window. Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level. The provisions for show windows are found in 210.62, 220.14 (G) and .43 (A). The requirement is for an appropriate number of

receptacles and loading allotment. The requirement must be met.

6. How far apart are we required to keep

water and electrical pvc conduit in an underground trench? Article 300 specifies no separation requirements.

7. Does bonding of equipment of services (250.92--bonding bushings around impaired knockouts) also encompass separately derived systems? In other words, if there is a concentric knockout with metal raceway, do I need a bonding bushing for a separately derived system? Assume the voltage is less than 250 to ground.

Yes V. Bonding 250.90 General. Bonding shall be provided where necessary to ensure electrical continuity

and the capacity to conduct safely any fault current likely to be imposed. 250.92 (B) Method of Bonding at the Service. Bonding jumpers meeting the requirements of this article shall be used around impaired connections, such as reducing washers or oversized, concentric, or eccentric knockouts. Standard locknuts or bushings shall not be the only means for the bonding required by this section but shall be permitted to be installed to make a mechanical connection of the raceway(s). 250.96 Bonding Other Enclosures. (A) General. Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal non–current-carrying parts that are to serve as equipment grounding conductors, with or without the use of supplementary equipment grounding conductors, shall be bonded where necessary to ensure electrical continuity and the capacity

to conduct safely any fault current likely to be imposed on them. Any nonconductive paint, enamel, or similar coating shall be removed at threads, contact points, and contact surfaces or be connected by means of fittings designed so as to make such removal unnecessary. 8. I was turned down for having a panel in a detached garage, using five 15 amp breakers as my disconnect means. It seems to be allowed per 225.33 A. Why am I turned down? Up to six disc. means are allowed in one location. However, you must meet the requirements of 225.39. In your case 5 x 15 = 75 so this would qualify, but if a main is used it would be a 60-amp minimum. 9. I have a new concern we are seeing in the field. Several jobs are providing for future circuit use by rolling up cables and flex and dead ending in a jbox. Some are leaving as much as 20’ rolled up in a tight circle of about 2’ diameter. It seems this

would possibly cause induction and heating on them. Is there a code reason to address them? While this might cause an issue if used, and still rolled up there is no induction without load. No code violation exists. 10. Does an acupuncture treatment room require compliance with NEC 517 patient care area? Acupuncture is not recognized currently as a medical procedure by state boards, so 517 does not apply. 11. NEC 210.64 requires a receptacle within 50ft of service equipment. If there is a back to back installation with meter outside and panel inside, would there have to be a receptacle within 50ft of meter and panel?

For 2014 code there has to be a receptacle for the service equipment. Our interpretation is that the location is where the service OCP is (230.66).

12. Where does NEC state I have to feed exit/emergency lights from local lighting circuits? Am I allowed to use a dedicated circuit?

700.12 F 2 addresses this when using unit equipment. Unit equipment would be the fixture or controller. Dedicated circuit use would not comply with unit equipment use.

13. Do light pole bases require ground rods per 250.32 if more than 1 circuit is present?

Joe Starling has new interpretation regarding this, and other instances of structure vs. equipment.

NC Department of Insurance Office of the State Fire Marshal - Engineering Division 1202 Mail Service Center, Raleigh, NC 27699-1202 919-647-0000 Structures versus Equipment Code: 2014 Electrical Code Date: June 28, 2017 Section: Article 100 – Structure Note:

The intent of this interpretation is to clarify the definition of a structure solely within the context of the electrical code. The electrical code’s definition of a structure shall not extend, apply, or modify the general or legal definition of a structure or where a structure is defined in other technical codes. Question 1: Does the electrical code consider a standby generator or a heat pump mounted on a stand a structure? Answer 1: No. The 2017 NEC has clarified the intent for the definition of a structure within the context of the electrical code. The new language states a structure is “[t]hat which is built or constructed, other than equipment.” Even though the current language in the 2014 NEC states “[t]hat which is built or constructed” and omits the statement “other than equipment,” the intent was never to include equipment. Article 100 of the NEC defines equipment as “[a] general term, including fittings, devices, appliances, luminaries, apparatus, machinery, and the like used as part of, or in connection with, an electrical installation.” Therefore, anything that solely is

defined as equipment, does not meet the definition of a structure. Question 2: Does the electrical code consider equipment stands structures? Answer 2: The stand is a “structure” per the broad language of the definition; however, if the stand is ancillary to the generator and its existence is for no other purpose, then such stands are not intended to be defined as a structure for purposes of applying the electrical code. Additionally, a post or similar object that has a panel, receptacle, switch, septic pump controls, etc., that is mounted on the post or similar object is also not intended to be defined as a structure for purposes of applying the electrical code if the sole purpose of the post or similar object is only for affixing the electrical equipment.

For all interps. see, http://www.ncdoi.com/OSFM/Engineering_and_Codes/Default.aspx?field1=Code_Interpretations&user=Code_Enforcement_Resources&field2=Interpretations4/2014 Electrical

The light poles are equipment and therefore 250.32 would not apply. This changes our stance on other equipment such as, pool panels on a rack, panel, receptacle, switch, septic pump controls, etc…

14. In regards to the Industrial Machinery exemption from 3rd party listing, how far does our jurisdiction go in hazardous areas? What if we have equipment in a Class 1 Div.2 location that is not listed?

§ 143-138. North Carolina State Building Code. (b9) Exclusion for Industrial Machinery. - Nothing in this Article shall extend to or be construed as being applicable to the regulation of the design, construction, location, installation, or operation of industrial machinery. However, if during the building code inspection process, an electrical inspector has any concerns about the electrical safety of a piece of industrial machinery, the electrical inspector may refer that concern to the Occupational Safety and Health Division in the North Carolina Department of Labor but shall not

withhold the certificate of occupancy nor mandate third-party testing of the industrial machinery based solely on this concern. For the purposes of this paragraph, "industrial machinery" means equipment and machinery used in a system of operations for the explicit purpose of producing a product or acquired by a State-supported center providing testing, research, and development services to manufacturing clients. The term does not include equipment that is permanently attached to or a component part of a building and related to general building services such as ventilation, heating and cooling, plumbing, fire suppression or prevention, and general electrical transmission. We have no obligation to inspect the equipment but we must maintain the safety and code compliance of the building and systems.

15. How do you determine OCP for a 10KVA/240V UPS?

Most units are marked on their nameplate with that information or have it in their installation

instructions. Without that info in review time we allow the load at 125% to size the OCP. Otherwise we need the unit information. For inspections follow the nameplate or manufacturer’s instructions.

16. For TP, my understanding is that I do not have to have the garage door installed if my panel is in the garage is lockable. If my panel is in the garage and has a lock on it and I am only energizing the garage GFCI receptacle circuit, is the house still required to be lockable? Per the NCEC 10.8.5 Security and Notification. The applicant shall maintain the energized electrical system or that portion of the building containing the energized electrical system in a secured and locked manner or under constant supervision to exclude unauthorized personnel. The applicant shall alert personnel working in the vicinity of the energized electrical system to its presence. There are many variables that would apply to any job site. We need to be sure we are meeting the

minimum requirement. In the case above how is the receptacle secure and locked? Safety being our main concern we see no harm in allowing a GFCI protected receptacle to be accessible. 17. Is a residential accessory building required to have GFCI protection on receptacles if it is constructed of a wood floor raised on cinder blocks and has a ramp and or stairs to access. No, per 210.8(A)(2) it states it must be at or below grade level. 18. What are the receptacle spacing requirements for areas within a residence with built-in cabinetry and book cases? I/E libraries, beside fireplaces, media room/walls. We have only required a receptacle where we encounter a countertop or desk top. (2) Wall Space. As used in this section, a wall space shall include the following: (1) Any space 600 mm (2 ft) or more in width (including space measured around corners) and unbroken along the floor line by doorways and similar openings, fireplaces, and fixed cabinets

19. Why is Mecklenburg county turning me down for my deck bond? It's 12" from the inside wall of the pool as I have been instructed to do per Union County. When using the alternate means per 680.26(B)(2)(b) you must meet all of the following requirements in which states (4) The required conductor shall be 450 mm to 600 mm (18 in. to 24 in.) from the inside walls of the pool. With this information, 12" is not within 18-24" and does not meet NCEC. 20. I recently installed a job with several runs of PVC due to the corrosive environment. The inspector turned me down for insufficient support. I had the conduits supported at three feet from the boxes and every five feet thereafter as I’ve always done. What’s the issue? In 352.30 we have the rules for support of PVC. The three feet from the box is consistent but differing sizes have different support requirements for the run. If you had ½” to 1” the run support spacing is three feet per the table.

21. Are non required GFCI receptacles required to be readily accessible? Only required outlets per 422.5. 110.3 B may impact that though. Also per 210.8 we have specified outlets. If not specified readily accessible would be unnecessary. 22. Can I run PVC on a roof to feed an RTU? There is no permanently installed ladder. Yes, if it meets requirements of Article 352. Concerns would be support, ambient temps. and protection. 23. When installing a disconnect to comply with 445.18, is it required to be Service Entrance rated? No. Remember this is just addressing the genset requirements. 24. I have several cash wrap stations on a job. They are all third party listed, but none of the switch or receptacle boxes are grounded. Do I have to accept this or can we require that the corrections be made?

We need to take pictures and contact the NRTL. We should not accept products that readily appear unsafe. Requiring corrections should come from the NRTL. We would be looking for an acceptable NRTL label without obvious flaws or they could apply for field labeling. 25. Are GFCI receptacles required on a wet bar countertop? Does the circuit have to be a 20A /#12 wire? a) Yes in 6’ of the sink. B) No. General use circuits are acceptable unless this is in a kitchen or dining room/area. 26. Is countertop receptacle spacing (2-4) required? If it is not in the kitchen? No, per 210.52 except for pantry and dining room/area. 27. I am replacing a service only, but have to move it 30'. Do I have to use AFCI protection for the new wire refeeding the old circuits? No, NCEC Amendment addresses this. 210.12 Arc-Fault Circuit-Interrupter Protection.

Branch Circuit Extensions or Modifications – Dwelling Units. In any of the areas specified in 210.12(A), where branch-circuit wiring is modified, replaced, or extended, the branch circuit shall be protected by one of the following: (1) A listed combination-type AFCI located at the origin of the branch circuit. (2) A listed outlet branch-circuit type AFCI located at the first receptacle outlet of the existing branch circuit. Exception: AFCI protection shall not be required where the extension of the existing conductors is not more than 1.8 m (6 ft) 15.24 m (50 ft) and does not include any additional outlets or devices.

28. I am replacing my service and have to move it a few feet. I have enough of the existing branch circuit wires to reach the new service but it is romex. Do I have to change the wire to UF cable in the new pipe? No, NCEC Amendment addresses this. 300.9 Raceways in Wet Locations Above Grade. Where raceways are in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceway in wet locations above grade shall comply with 310.10(C).

Exception: The raceway shall not be considered a wet location if: (1) The section of raceway routed in a wet location above grade does not exceed 1500 mm (5 ft) in length; (2) Any fittings or conduit bodies are watertight and listed for use in wet locations; and (3) Raceway is open at its termination point in a dry location. 29. Does a microwave/hood need to be on a dedicated circuit? (422.16.B (3)(4)) then 210.23(A)(2) Maybe. It would depend on the load and the manufacturer’s requirement. 30. Can a dishwasher and disposal be on the small appliance circuit? No per 210.52 B. 31. Do standalone diesel dispensers require seal-offs?

514.9 (A), Requires at the dispenser, a listed seal shall be provided in each conduit run entering or leaving a dispenser or any cavities or enclosures in

direct communication therewith. However, 514.2 (A) refers to Unclassified Locations. Where the AHJ can satisfactorily determine the flammable liquids having a flash point below 38 degrees C (100 degrees F), such as gasoline, will not be handled, such locations shall not be required to be classified. NFPA 30 considers Class 1, flammable liquids to have a flash point less than 100 degrees F. Class 2, combustible liquids have a flash point between 100 degrees and 140 degrees F. Because diesel is a Class 2 liquid, it does not require a Class 1 Location, therefore a seal-off fitting would not be required as long as the conduit does not pass through the classified area. 32. Do all emergency systems in health care facilities have to meet the requirements of article 700 or 517 (Essential System)?

Deletion: 517.2 Definitions – Emergency System.

The term emergency system has been eliminated from Article 517, leaving only essential electrical system with the three separate branches: the

critical, life safety and the equipment. The diagram in Figure 517.30, No. 1 has been re-worked to reflect these changes as well. In an effort to correlate the requirements of the NEC and, in particular, Article 517 with NFPA 99, Health Care Facilities Code and section 517.30(B) was re-organized in regard to the essential system of a hospital. This action eliminated references to the emergency system as this is not addressed to NFPA 99. In incorporating the changes made to correlate with NFPA 99, emergency system is no longer used in Article 517. This removes major confusion resulting from the previous use of the word “emergency” in similar, yet sometimes quite different, ways in Article 517 and in Article 700.

33. I have an apartment building with a 2000 amp, 120/208V, 3 phase service, feeding 5 single phase meter centers. The meter centers have 200 amp main breakers, feeding SER cable to sub-panels in each one of the units. The SER carries the full load of each of the units. I installed 4/0 Al. SER, but the inspector said I would need 300 MCM SER, per 310.15(b) (16). Is he correct?

Per the amendment in the NCEC the conductor size can be based on 75 degree C column of 310.15 (B) (16). Since 4/0 Al. is good for 180 amps, it would be acceptable as long as the load is 180 or less, because you can use the next largest standard size overcurrent protection, per 240.4 (B), which would be 200 amps. As a point of interest, it is easy to mistakenly use article 310.15 (B) (7) to size the feeders, because they carry the full load of the service, however the 120/208 voltage of the system, would prohibit its use.

IV. Electrical Website review

https://www.mecknc.gov/LUESA/CodeEnforcement/Inspections/trades/Electrical/Pages/default.aspx


