section 27 05 26 technology grounding system osborn final package/20150409... · section 27 05 26...

SECTION 27 05 26 TECHNOLOGY GROUNDING SYSTEM

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the requirements for an isolated supplemental grounding system that shall be utilized for the purposes of grounding the Technology and Communications systems of this project.

1.2 SYSTEM DESCRIPTION

A. The Electrical Contractor shall provide the Technology Grounding System. The Technology Grounding System is a supplemental and, except where indicated, isolated grounding system, consisting of busbars, cabling, lugs and other accessories as indicated on the Drawings. The system shall consist of the installation of one Telecommunications Main Grounding Busbar (TMGB) and a series of Telecommunications Grounding Busbars (TGB’s), one TGB per TR, interconnected with a hierarchical network of Telecommunications Bonding Backbone (TBB) back to the TMGB. The TMGB is then bonded to the electrical service’s Grounding Electrode Conductor (GEC). Use of minimums described in the Specifications where other indication is given on the drawings shall be corrected to the satisfaction of the Engineer by the responsible Contractor at no cost to the Owner or Engineer. Failure to comply with these Specifications, or other indications on the Drawings, shall be corrected to the satisfaction of the Engineer, at no cost to Owner or Engineer. For additional information on these minimums, refer to the Installation paragraphs in Part 3 of this Section.

B. The Electrical Contractor shall provide signage regarding the Technology Grounding System in accordance with the Specifications and Drawings.

C. The Technology Contractor shall bond technology equipment to the Technology Grounding System, providing all materials per these Specifications, and in full compliance with all published codes, ANSI J-STD 607’s latest revisions and any/all applicable addenda or ratified revisions.

D. The Technology Grounding System shall be a supplemental grounding system and shall be bonded to the Building Grounding Electrode System at the Grounding Electrode Conductor and/or other approved ground in accordance with Article 250 of the National Electrical Code (NEC) and all other related articles.

E. Distribution of the Technology Grounding System shall be in accordance with the Specifications and Drawings.

F. Each entrance facility, equipment room, telecommunications room and cross connect area shall be equipped with either the TMGB or a TGB.

G. Each TGB shall be bonded to the TMGB in a star configuration. Daisy chaining of grounds is strictly forbidden.

H. All metallic cross connect hardware, pathways and related hardware, and other non-current carrying technology equipment shall be bonded to the local TGB.

I. Where copper cabling is routed to an area, either in another building, or with a separate electrical service, the Technology Contractor shall provide primary protective equipment terminations at both ends of the cabling.

J. All racks shall be assembled with paint piercing ground washers, grounding strip and bonding jumpers at each intersection of disparate pieces of the rack assembly.

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27 05 26 – TECHNOLOGY GROUNDING SYSTEM

K. All cable tray shall be bonded sequentially so as to assure that the cable tray is electrically continuous with a current carrying capacity of a minimum of a #6 wire. Where cable tray structure is removed to accommodate field conditions, these areas shall be circumvented with a bonding conductor to continue the continuity requirements as previously outlined.

1.3 SECTION INCLUDES

A. Busbars

B. Conductors

C. Connection Devices

D. Labeling

E. Tools

F. Grounding Accessories

G. Labeling Requirements

1.4 RELATED WORK SPECIFIED ELSEWHERE

A. Section 27 05 00 – Technology Common Work Results

B. Section 27 05 24 – Technology Firestopping

C. Section 27 05 28 – Pathways for Communications Systems

D. Section 27 15 00 – Structured Cabling System

E. Section 27 21 00 – Data Communications System

F. Section 27 25 00 – High-Density Wireless LAN

G. Section 27 31 00 – Telephony System

H. Section 27 41 16 – Classroom AV System

I. Section 27 41 17 –Student Dining AV System

J. Section 27 41 18 – Music-Vocal Room AV System

K. Section 27 41 19 – Gymnasium Audio System

L. Section 27 41 20 – Auditorium AV System

M. Section 27 51 23- Central Sound and Paging

N. Section 27 51 25 – Intercom System

O. Section 27 51 75 – Wireless Clock System

P. Section 28 13 00 – Access Control System

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Q. Section 28 15 00 – Intrusion Detection System

R. Section 28 23 00 – Video Surveillance System

S. Division 26 - Electrical

1.5 REFERENCES

A. Codes, regulations and standards referenced in the Section are, in order of precedence:

1. NFPA 70 – The National Electrical Code, including but not limited to, Article 250 Grounding and Bonding

2. NFPA 780 – Standard for the Installation of Lightning Protection Systems 3. ANSI J-STD 607-A – Commercial Building Grounding and Bonding Requirements for

Telecommunications 4. BICSI TDMM – Telecommunications Distribution Methods Manual 5. IEEE 1100 – IEEE Recommended Practice for powering and Grounding Sensitive

Electronic Equipment

1.6 DEFINITIONS

A. The Definitions contained within shall be in addition to those defined in Section 27 05 00 TECHNOLOGY COMMON WORK RESULTS.

B. Definitions:

1. Bonding – The term “Bonding” shall refer to the permanent joining of electrical parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current that is likely to be exposed.

2. Bonding Conductor (BC) – The term “Bonding Conductor” shall mean a conductor used specifically for the purpose of bonding.

3. Building Grounding Electrode System – The term “Building Grounding Electrode System” shall mean the Grounding Electrode(s), and the Grounding Electrode Conductor(s).

4. Coupled Bonding Conductor (CBC) – The term “Coupled Bonding Conductor” shall mean a bonding conductor placed, e.g. strapped, on the outside of any technology cable, used to suppress transient noise.

5. Grounding Electrode (GE) – The term “Grounding Electrode” shall mean a device that establishes an electrical connection to the earth.

6. Grounding Electrode Conductor (GEC) – The term “Grounding Electrode Conductor” shall mean the conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded conductor. Or to both, at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at the source or separately derived system.

7. Telecommunications Bonding Backbone (TBB) – The term “Telecommunications Bonding Backbone” shall mean a conductor that interconnects Telecommunications Grounding Busbars.

8. Telecommunications Main Grounding Busbar (TMGB) – The term “Telecommunications Main Grounding Busbar” shall refer to the primary busbar used to create the primary point of interconnection for the Technology Grounding System, and is the busbar bonded to the building electric service ground.

9. Telecommunications Grounding Busbar (TGB) - The term “Telecommunications Grounding Busbar” shall refer to any secondary busbar used to create the Technology Grounding System, and is fed from the TMGB.

10. Continuous Ground – The term “Continuous Ground” shall be defined as the ability of a conductor or conductive piece of equipment or device to maintain the current carrying

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capacity of a minimum #6 AWG wire rated at 90˚ C by the latest revision of the NEC indefinitely from all arbitrary points A to all arbitrary points B. Such a rating shall be consistent throughout the system in question. All parts utilized to create such a continuous ground shall be UL listed for this purpose.

1.7 SUBMITTALS

A. For additional requirements, refer to Section 27 05 00 – TECHNOLOGY COMMON WORK RESULTS

B. Product Data Sheets

1. Product Data Sheets required under this Section’s scope of work shall include:

a. Busbars b. Conductors c. Lugs d. Labels e. Tools f. Accessories

C. Shop Drawings

1. Shop Drawings shall be submitted that include a riser diagram of the Contractor’s understanding of the exact location of busbars, the exact nature of the bonding requirements, the nature of the assembly requirements, the exact pathway of the cable routing, and typical points and methods of attachment of the conductors and busbars to the structure.

2. Shop drawings shall include any drawings indicating installation requirements of special tooling that is a function of these Specifications.

D. Samples

1. The Engineer reserves the right to request, and have submitted, additional samples, or samples not explicitly requested within these documents.

2. Samples required under this section include, but are not limited to:

a. Crimps indicating the proper use of the die required to terminate the bonding conductors. This requirement shall be required by both the Electrical Contractor for the construction of the Technology Grounding System, and the Technology Contractor for the provision of the bonding conductors required under this Section. Sample shall be provided for #6 AWG, #2 AWG and #2/0 AWG.

b. Busbar warning placard.

3. Samples shall not be returned to the Contractor.

1.8 PRODUCTS INSTALLED BUT NOT SUPPLIED BY THE CONTRACTOR

1. The Technology Contractor(s) shall be required to provide all bonding conductors and related hardware required to bond all technology and communications equipment to the Technology Grounding System. Unless specified elsewhere in these documents the Contractor shall bond the devices, equipment and related hardware to the closest available Technology Grounding Busbar (TGB) or to the Technology Main Grounding Busbar (TMGB).

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1.9 QUALITY ASSURANCE

A. Qualifications

1. The Contractor shall possess and utilize the special tooling required to fulfill the requirements of this Section. Should training be required for the assurance of proper operation of these tools, the Contractor shall possess and submit a copy of this certification.

2. The Contractor shall have copies of, and adhere to the requirements of the standards indicated above.

B. Regulatory Requirements

1. All devices, Materials and equipment provided under the scope of this Section shall be new and UL listed for the application for which it is being utilized.

2. All Materials and practices shall be compliant with all local, state and federal regulations, as well as governing standards as indicated herein. The regulations include, but are not limited to, the:

a. NEC b. NESC c. NFPA

3. The grounding system shall comply to the latest revisions of ANSI J-STD 607-A, shall not be connected so as to create pathways for circulating currents, and shall be constructed so as to complete the intent of the design as indicated on the Drawings. If for any reason a conflict arises between the Specifications and the Drawings, the Contractor shall bring this conflict to the immediate attention of the Engineer. The Engineer shall provide the sole resolution to any conflict. Should the Contractor acknowledge after the bidding, the financial responsibility of the resolution shall be borne by the Contractor.

1.10 PROJECT/SITE CONDITIONS

A. Conductors placed prior to the completion of other trades’ work shall be enclosed in such a fashion so as to protect the conductors until such time that the Conductors shall be protected from damage caused by ongoing work. Any cabling damaged during construction shall be replaced in whole, including all requirements indicated for the initial installation of that Conductor, by the Electrical Contractor prior to Owner Acceptance. All financial responsibility for the replacement of damaged Conductors shall be borne by the Electrical Contractor.

1.11 SEQUENCING

A. The Contractor shall coordinate the installation of all Conductors, Busbars and related Materials with the Project Schedule to ensure that all of the aforementioned items are installed as intended by these Documents.

1.12 SCHEDULING

A. All Installation, terminating and testing of the Technology Grounding System shall be completed prior to the installation and commissioning of any of the related Technology Systems. The Electrical Contractor shall coordinate the timing of the installation with any of the related systems providers, so as to assure this timing.

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1.13 WARRANTY

A. The Contractor shall provide a three year warranty for the materials and labor provided under the scope of this Section.

1.14 OPERATIONS AND MAINTENANCE MANUALS

A. The Contractor shall include the riser diagram and testing data from this system within a unique section of the Operation and Maintenance Manual.

PART 2 - PRODUCTS

2.1 GENERAL

A. All products shall be new and UL listed for the applications for which they are being utilized

2.2 MATERIALS

A. Busbars

1. All busbars shall be ¼” solid electro-tin plated copper. 2. All busbars shall be ASTM B187-C11000 compliant. 3. All busbars shall be UL and cUL listed to UL 467 and c22.2 respectively. 4. TMGB

a. The TMGB shall:

1) be a minimum of 20” long, 2) have a minimum of 24 pairs of 1/4” holes, and 3) have a minimum of 3 pairs of 3/8” holes.

b. Acceptable busbars shall be:

1) Panduit GB4B0624TPI-1 2) Erico TMGB-A20L27PT 3) Harger TGBI14420TMGBKT

5. TGB

a. All TGB’s shall (size per BICSI TDMM):

1) be a minimum of 12” long, 2) have a minimum of 6 pairs of 1/4” holes, and 3) a minimum of 3 pairs of 3/8” holes.

b. Acceptable busbars shall be:

1) Panduit GB2B0306TPI-1 2) Erico TGB-A12L06PT 3) Harger TGBI14412TMGBKT

6. Insulators

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a. All insulators shall be manufactured from an environmentally friendly, halogen free nylon material, reinforced with fiberglass.

b. All insulators shall be 2” tall. c. All insulators shall meet UL 94 VO for self extinguishing. d. All insulators shall be provided in kit form with the busbar from the manufacturer of

the busbar.

7. Brackets and Fasteners

a. All brackets and fasteners shall be type 304 stainless steel. b. All brackets shall be 1/8” thick. c. All brackets and fasteners shall be provided in kit form with the busbar from the

manufacturer of the busbar.

B. Conductors

1. Conductors shall be as specified within the materials and methods of Division 26, but shall be compliant with any additional requirements listed in this Section and on the Drawings.

C. Connection Devices

1. Lugs (Terminations)

a. All lugs shall be UL listed for use up to 35kV, temperature rated to 90 degrees C and CSA certified to 600V.

b. All lugs shall be two hole and shall have a long barrel construction with sufficient length to allow for two discreet crimps.

c. All lugs shall be tin plated to inhibit galvanic corrosion. d. All lugs shall be constructed with an inspection window to visually assure full

conductor insertion. e. All lugs shall be tested by Telcordia, and be NEBS level 3 compliant. f. All lugs shall be compliant with ANSI J-STD-607-A.

2. HTAPs

a. All HTAPs shall be UL listed and CSA certified to 600V. b. All HTAPs shall contain a crimp location for the main cable run and a minimum of

one tap. c. All HTAPs shall be designed for use with continuous cabling runs. d. All HTAPs shall be tin plated to inhibit galvanic corrosion. e. All HTAPs shall come with a clear cover having a UL 94 V-0 flame rating and an

oxygen index of 28 providing self-extinguishing, flame retardant properties.

D. Labeling Materials

1. Wall mounted labels

a. Wall mounted labels shall be fabricated 1/8” thick indoor/outdoor use laminated impact acrylic engraving materials utilizing green surface with white substrate.

b. Wall mounted label shall be a minimum of 3” high by 4” wide. Size placard to fit all required verbiage as specified below.

2. Conductor mounted labels

a. Conductor mounted labels shall be machine generated and self laminating.

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E. Tools

1. The crimp tool shall be specifically designed for the use as intended by these documents, i.e. the permanent and irreversible attachment of the termination hardware specified within this Section.

2. The crimp tools shall be capable of utilizing multiple heads, either rotating or replaceable dies, which contain a die number able to be embossed into the lug indicating that the correct die has been used relative to the gauge of the conductor has been properly mated to the termination lug.

3. The crimp tools shall contain a physical means by which to notify the user that sufficient pressure has been applied to the lug, and will not allow the tools to generate additional pressure thereby damaging or destroying the cable retention.

4. The crimp tool shall provide uniform and appropriate pressure to complete the crimp without harmful deformation of the crimp lug.

F. Accessories

1. Grounding Straps (GS)

a. Straps shall be constructed of flexible tinned copper flat braid. b. Straps shall utilize all compression flat lugs. c. Strap kit shall come with a toothed lock washer for each bolt location. d. Provide grounding straps as necessary at any/all points of assembly where

electrically continuous requirements are sited in these Documents.

2. Paint Piercing Ground Washers (PPGW)

a. PPGW shall not require paint scraping. b. PPGW shall have a 3/8” stud c. PPGW shall have machine cut spurs to provide the piercing action through any of

the coating processes potentially encountered. d. PPGW kits shall contain antioxidant treatment. e. Provide a minimum of one PPGW at each joint of each rack to assure that the

assemble rack is electrically continuous throughout its construction. The Engineer reserves the right to verify this conductivity, and, if not properly established, require the contractor to disassemble and re-assemble the rack with the requisite PPGW’s.

3. Electrostatic Discharge (ESD) Port Kit

a. ESD Port kit shall contain one 4mm plug socket that shall accept a standard ESD wrist strap.

b. ESD Port kit shall contain antioxidant treatment c. ESD port kit shall contain a thread forming screw designed to clear any paint that

may exist within the screw thread. d. ESD Port kit shall include one ESD wrist strap. e. Contractor shall provide one ESD port kit per rack installed.

PART 3 - EXECUTION

3.1 EXAMINATION

A. The Contractor shall inspect the point of bonding between the Technology Grounding System and the Building Grounding Electrode System. Verify the capability of the systems to perform as expected.

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3.2 PREPARATION

A. Surface Preparation

1. The Contractor shall prepare all bonding points by cleaning, and where applicable applying antioxidants prior to the installation of any ground lugs.

3.3 INSTALLATION

A. General

1. Technology System grounding and bonding shall be in accordance with the NEC and NFPA. Cables and equipment shall be grounded in compliance with ANSI/NFPA 70 and local requirements and practices. Equipment includes, but is not limited to, cross connect frames, patch panels and racks, active telecommunications equipment and test apparatus and equipment. utilizing a conductor sized at 2kcMil per linear foot of conductor to the busbar, with a minimum of a # 6 AWG bonding conductor to provide direct bonding between equipment located in a given area and the associated TGB. In this case, should a dedicated Technology Grounding System not be available, contact the Engineer for immediate resolution. Note that the Technology Grounding System shall be an independent system from the Building Grounding Electrode System with the exception of the bond to the Building Grounding Electrode System.

2. Should detail with regard to the system be missing, or no explicit indications given, provide a Telecommunications Bonding Backbone at the network core, bond the TMGB back to the electrical system’s GEC, provide TGB’s in each of the telecommunications rooms, and at each telecommunications enclosure not housed in a telecommunications toom. Provide homerun TBB’s back to the TMGB. No TBB shall be sized under a minimum of a #2 AWG. No system bond to the GEC shall be less than a #1/0. No equipment or cable bond to the system shall be less than a #6 AWG. However, these are least common denominators to be utilized where no other indication is given on the Drawings.

3. The Technology Contractor shall bond all non-current carrying equipment provided by the Technology Contractor including, but not limited to, cable trays, racks, wall fields, protection devices, etc., to the local TGB.

4. The Electrical Contractor shall bond all non-current carrying equipment provided by the Electrical Contractor including, but not limited to, cable trays, conduit, back boxes, etc., to the local TGB.

B. Busbars

1. All busbars shall be located as indicated on the Drawings, and installed in accordance with manufacturer’s suggested installation practices.

2. All Busbars shall be labeled with a wall mounted placard. Place placards as indicated on the Drawings and as enumerated elsewhere in these specifications. Should the Drawings not show location, coordinate the final location in the field with the Engineer by means of a formal RFI.

C. Conductors

1. All conduits routed through metallic conduit for greater the 12” shall be bonded to the conduit at both the point of entry and exit. The Contractor shall utilize HTaps and a #6 AWG wire to bond over to the conduit.

2. The Contractor shall keep all cabling continuous throughout the length of the run. 3. All conductors shall be routed by means of a smooth radius turn consisting of a radius

that is a minimum of 10 times the conductor diameter.

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4. Conductors 1/0 and greater shall make any required turns by means of a smooth bend whose radius no less than 48”.

5. Conductors shall remain insulated from structure throughout the length of the runs other than that which is indicated on the Drawings. Should the conductor be required to route open architecture through a plenum rated space, and have an outer jacket that is not plenum rated, the Contractor shall utilize a bare conductor cable encased in a plenum rated innerduct.

6. Ground conductors routed below grade shall not be permitted to be run in a direct burial fashion. Ground conductors routed below grade shall be routed in a continuous HDPE conduit that is sized based on a 28% fill ratio where not explicitly indicated on the Drawings.

7. All conductors terminating at a busbar shall be terminated by exothermic weld, unless otherwise noted.

8. Any devices or equipment that requires bonding conductors to assure a continuous ground path shall utilize a ground strap as specified herein, or an accessory provided by the manufacturer of the device or equipment, designed specifically for the purposes of providing a continuous ground. Such bonding where accomplished by use of an off the shelf lug, instead of an engineered hardware accessory from the manufacturer, shall utilize a lug or lug like mechanism with a two hole method of attachment.

9. Label all conductors as indicated on the Drawings and in these Specifications.

D. Lugs

1. The Contractor shall insert cable completely into the lug prior to crimping the lug. 2. All lugs shall be affixed by applying two discreet crimps. The first crimp shall be made at

the point closest to the screw holes, with the second crimp being made closer to the cable entry in that specific order.

3. Each crimp shall be made by means of a tool specifically designed for the purpose of crimping lugs, and having the capability of embossing the die number into the lug as the lug is crimped, as specified herein. The Contractor shall utilize the appropriate embossing die. The die shall be positioned on the crimp as recommended by the manufacturer, and so the embossed die number is easily visible.

4. The Contractor shall not utilize any standard pliers or other tools not explicitly designed to perform these crimps. All tools utilized for crimping shall designed to perform such duty and not damage either the crimp device or the cable within.

5. The Engineer reserves the right to require any/all crimps to be re-installed should any of these specified materials and/or requirements not be followed.

E. Labeling

1. Conductors/Cabling

a. All cabling shall be labeled with a machine generated label, as to the source and destination room and busbar, as well as cable ID. Cable labeling shall be protected with a clear shrink tube covering as illustrated on the Drawings, or by a machine generated, self-laminating label designed to properly fit the conductor diameter of the conductor to which the label is to adhere.

2. Busbars

a. Each Busbar shall be labeled with the following information.

1) Busbar name 2) Source of ground 3) Room being serviced 4) Standard warning

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b. The label shall be an engraved placard as specified above. c. The label shall be permanently affixed with the appropriate wall anchors for the

type of surface to which the label is being applied, recessed into the walls, and utilizing screws to attach, at locations indicated on the drawings.

d. The label shall be located so as to be easily readable by a person of standard height standing in front of the busbar.

e. In addition to the identification information listed above, a standard warning shall be provided that shall state: “WARNING – The device is an integral part of the Technology Grounding System. Do not disconnect. Should any portion of this system require servicing, contact personnel at extension: <confirm number with Owner and provide this information>”

3. Terminations and Intersections of Equipment

a. All points where a ground strap or ground conductor is attached to a device or piece of equipment, the Contractor shall utilize a paint piercing ground washer as specified herein.

b. At intersections of equipment, such as perpendicular intersections of cable runway, or other such splice points where electrical continuity may come into question, the Contractor shall utilize paint piercing ground washer as specified herein, and if tested and deemed necessary, grounding straps.

c. All racks shall be assembled utilizing paint piercing ground washers at each major intersections to assure complete continuity of ground.

3.4 FIELD QUALITY CONTROL

A. Site Test and Inspections

1. All grounding shall be tested to assure a ground impedance of less than or equal to 5 ohms.

B. Record Drawings

1. Actual installation results shall be documented and submitted with the entire Record Drawing set as outlined herein.

C. System And Service Shutdown

1. Should the Contractor need to shut down any system to perform any bonding, etc., the Contractor shall provide warning to the Owner as outlined elsewhere in these Documents.

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