918.01

Section 918. ELECTRICAL AND LIGHTING MATERIALS

918.01 Conduit. All conduits must be UL labeled. Where cables areencased in concrete, use concrete Grade P3 per section 601 and ifsteel reinforcement is called for, reinforcement must meet section 905.

A. Galvanized Steel Conduit. Galvanized steel conduit must meet ANSIC80.1. Galvanized steel conduit must be manufactured according toUL 6 and must be UL listed and labeled.

Couplings and fittings must meet ANSI C80.4 and be hot-dipped galva-nized. Elbows and nipples must conform to the specifications for con-duit. All fittings and couplings for rigid conduit must be of thethreaded type.

B. Smooth-Wall Schedule 40 PVC Conduit. Smooth-wall polyvinyl chlo-ride (PVC) conduit, fittings and accessories must be manufactured frompolyvinyl chloride meeting ASTM D 1784 and must comply with allthe applicable requirements of NEMA TC2 and UL 651.

C. Smooth-Wall Schedule 80 PVC Conduit. Smooth-wall polyvinyl chlo-ride (PVC) conduit, fittings and accessories must be manufactured frompolyvinyl chloride meeting ASTM D 1784 and must comply with allthe applicable requirements of NEMA TC2 and UL 651.

D. Smooth-Wall Coilable Schedule 40 PE Conduit. Smooth-wall coila-ble polyethylene conduit will be tested according to MTM 724. Conduitmust be marked according to ASTM D 3485. Markings must includea producer code and the designation HDPE or Type III, as appropriate.Conduit must be produced from material with a color and ultra-violetstabilization code of C, D, or E as defined in ASTM D 3350. All conduitfor use above ground must be black unless otherwise specified. Conduitmust be high-density polyethylene Type III, Grade P-33, Category 5,Class C, per ASTM D 3485, D 3350 and D 1248.

E. Smooth-Wall Coilable Schedule 80 PE Conduit. Smooth-wall, coila-ble, polyethylene plastic conduit must meet NEMA TC7, UL651 and651A, ASTM D 3485 or ASTM D 2447applicable sections. Conduitmust be high-density polyethylene Type III, Grade P-33, Category 5,Class C, per ASTM D 3485, D 3350 and D 1248.

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F. Rigid Fiberglass. All conduit and fittings must be filament woundconsisting of E-glass and corrosion resistant epoxy resin manufacturedfor use at temperatures from -40 °F to 230 °F. Conduit must be pig-mented with carbon black for ultraviolet protection and fire resistantper UL 94. All fiberglass conduit must be heavy walled (HW) and meetthe specifications, labeling and testing of ANSI/NEMA TC14.

918.02 Electrical Grounding System. The materials for the electricalgrounding system must meet the following requirements.

A. Flexible Grounding Connection. The flexible grounding connectionmust be made of extra flexible, flat, tinned copper braid, with seamlesstinned copper ferrules at each end, having a minimum cross sectionalarea equal to that of the grounding cable. The ferrule must be capableof being formed to fit the curved surfaces of a clamp or pipe.

B. Grounding Cable and Bonding Jumper. The grounding cable and thebonding jumper must be a No. 2 AWG, 19 stranded bare soft copperwire conforming to ASTM B 8.

C. Grounding Rod. The grounding rod must be a 3⁄4 inch minimumdiameter, copper clad steel rod of 10 foot minimum length having nomore than 10 ohms resistance to ground.

D. Connecting Hardware. The connecting hardware must be siliconbronze conforming to ASTM B 124M. All materials must be suppliedby the same manufacturer to ensure compatibility.

918.03 Electrical Wire and Cable. All wire and cable must conform tothe National Electrical Code (NEC) and any local ordinances whichapply and must meet all applicable ASTM specifications. Cable mustbe UL approved. Conductors must be coated soft drawn copper and bestandard American Wire Gauge (AWG) sizes as noted on the plans.

All wire and cable must have the size, voltage rating, type of insulationand the manufacturer’s name permanently marked on the outer cov-ering at regular intervals. The manufacturer must furnish to the Engi-neer and the Contractor all splicing or terminating informationnecessary for proper installation of the cable. Bare ground conductorsmust be soft drawn copper.

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918.04

A. Overhead and Underground Service Wire and Cable. Cable mustconsist of two-1/C polyethylene insulated conductors assembled undera common polyethylene jacket. The cables must meet IMSA 20-1 (ae-rial and duct) as modified by the following: The size and number ofconductors must be as shown in the contract documents. In addition,the insulation thickness for Nos. 6-8 AWG must be 1143 microns(average) and 1016 microns (minimum).

B. Traffic Signal Wire and Cable. These cables are for use in aerial,underground duct, or direct burial systems. All cables, except No. 51-5 (loop), must be polyethylene insulated and polyethylene jacketedwith 2 to 20 conductors. The No. 51-5 (loop) must be polyvinyl chlo-ride insulated, nylon jacketed, loosely encased in a polyethylene tube.The size and number of conductors must be as shown on the plans oras listed in the proposal.

The cables must meet IMSA 20-1 (aerial and duct); 20-3 (aerial self-supporting); 20-5 (direct burial); 40-2 (aerial and duct); 40-4 (aerialself-supporting); 50-2 (loop lead-in); 51-5 (loop), with the followingexceptions and additions:

1. Conductors. The conductors of all cables must be concentricstranded, Class B, soft copper meeting ASTM B 8, except that nojoints of any kind are permitted in the conductors after completionof the final drawing operations.

2. Circuit Identification. Color coded insulation must be used per Table5.1 of IMSA 20-1, 20-2 and 20-5; Table 5.2 of IMSA 40-2 and40-4. Numerals or words printed on the insulation for the purposeof conductor identification are not acceptable.

C. Messenger Cable. The messenger cable must be stranded, maximum7-wire, 1⁄4 inch, Class C, galvanized, extra high strength steel strandmeeting ASTM A 475, as specified under 9.1-A of IMSA 20-3 (aerialself-supporting) and 11.1 of IMSA 40-4 (aerial self-supporting).

918.04 Direct Burial Cable. All direct burial cable must be installedin conduit unless otherwise noted on the plans.

Direct burial cable in conduit must be approved for use in wet locationsaccording to the National Electrical Code.

All cable must be UL listed and unless otherwise indicated, must berated at 600 volts. The cable must be rated 194 °F dry and 167 °Fwet and be suitable for installation in wet and dry locations, exposed

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to the weather, and be resistant to oils and chemicals. The cable mustmeet UL 44.

Any cable used for an electric service entrance run must have a ratingwhich includes a USE rating.

Cable sized No. 2 AWG and smaller must be UL listed Type RHH/RHWand may be Type RHH/RHW/USE.

Cable sized larger than No. 2 AWG must be UL listed Type RHH/RHW/USE.

The UL listing mark, cable voltage, insulation type and ratings, as wellas the cable size must all be clearly printed on the cable in a colorcontrasting with the insulation color.

A. Conductors. Conductors must be uncoated copper meeting ASTMB 3 and must be Class B stranded per ASTM B 8. The manufacturer’sinsulation curing process must be non-injurious to the uncoated con-ductors. Conductors must be UL 44 approved.

The insulation on cables sized larger than No.2 AWG must be colorcoded by having not less than 12 inches of cable ends length field-taped with half-lapped color tape.

All electric cables smaller than No. 2 AWG must be color coded solid,painted full. Neutral wires must be color coded white. Single phase 3-wire runs of cable must be color coded one black, one red and onewhite and single phase 2-wire runs must be similarly color coded basedon the applicable phase(s) and neutral. Insulated ground wires mustbe green.

918.05 Equipment Grounding Conductor. Grounding conductors mustbe bare, annealed copper wire meeting ASTM B 3 and must bestranded per ASTM B 8, Class B.

918.06 Handholes.

A. Concrete. Concrete must be Grade P2 meeting section 601.

B. Steel Reinforcement. Steel reinforcement must be No. 15 bar orwelded cage mesh as shown on the plans.

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C. Frame and Covers. Frame and Covers must be made of steel andclassified as light duty or heavy duty. All covers must read ‘‘MDOTELECTRIC, TRAFFIC SIGNAL’’ or ‘‘TRAFFIC CONTROLS’’ with the lo-cation and size of the letters as specified on the handhole detail sheet.

1. Light Duty Cover. Light duty covers must be of the type specifiedon plans or an approved equal.

Round Cover-East Jordan #2982A-18 or Neenah Foundry #R-6012-D

2. Heavy Duty Cover. Heavy duty covers must be of the type specifiedon plans or an approved equal.

Round Cover-East Jordan #2860A or Neenah Foundry #R-6052-D

D. Polymer Concrete Handhole Boxes and Covers. The handhole boxmust be constructed of polymer concrete and reinforced by a heavyweave fiberglass.

The enclosure and covers must be heavy duty, designed and tested to-50 °F, and have a compressive strength of at least 11,000 psi. Coversmust have a minimum 0.5 coefficient of friction.

1. Boxes. The handhole boxes must be a nominal size of 17 by 30 by12 inch, be heavy duty and rated for 5000 pounds over a 10 by10 inch area, and be stackable.

2. Covers. The handhole covers must have a service load of at least15000 pounds over a 10 by 10 inch area, have a logo imprint of‘‘TRAFFIC SIGNAL’’ or ‘‘TRAFFIC CONTROL", and be secured byseries 300, 3⁄8 inch-16NC hex stainless steel bolts and washers.

E. Alternate materials may be approved by the Engineer for handholes;select from the Qualified Products List.

918.07 Light Standard Foundation.

A. Concrete. Use Grade P2 concrete meeting section 601.

B. Steel Reinforcement. Use steel reinforcement as shown on the plansand meeting section 905.

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C. Anchor Bolts, Nuts and Washers. Anchor bolts, nuts and washersmust meet subsections 908.15.A and B. Anchor bolts must be sizedand placed (specified bolt circle) per the detailed plans for the speci-fied light standard. Complete anchor bolt installation and tighteningaccording to subsection 810.03.N.

All anchor bolts 1 inch in diameter and greater must have series 8UNthreads. Anchor bolts less than 1 inch in diameter must be coarsepitch. Anchor bolts must be threaded a distance 1 inch greater thanthe anchor bolt projection shown on the plans.

D. Ground Rods. Use 8 foot, copper clad steel, 5⁄8 inch diameter,ground rod.

1. Grounding Wire. Grounding wire for the street lighting unit must beNo. 6 stranded bare copper wire.

2. Conduit. Conduit must be provided in the foundation to allow forplacement of conductors and grounding wires as shown on the plansand must meet subsection 918.01.

918.08 Light Standards. Light standards must be steel, aluminum oras specified on the plans. Poor welding workmanship as noted by visualinspection will be sufficient cause for rejection. Light standards mustbe designed according to the AASHTO Standard Specifications forStructural Supports for Highway Signs, Luminaires and Traffic Signals.The Wind Importance Factor for the design wind speed must be basedon a recurrence interval of 50 years. The alternative method for de-termining the wind speed is not allowed. The Fatigue Importance Factormust be Category I. Calculations for the design of the light standardmust be sealed by a professional engineer licensed in the State ofMichigan and submitted to the Engineer for approval.

A. Steel Light Standards.

1. Shafts. The shaft must be fabricated from either hot rolled lowcarbon steel or high strength low alloy steel, and must have a mini-mum tensile yield strength of 50,000 psi when tested either beforeor after fabrication.

2. Handhole. Each light standard must have a reinforced handholewith a steel cover and a grounding nut or lug located inside theshaft easily accessible from the handhole.

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3. Anchor bases. Anchor bases must be one piece cast steel or hotrolled steel plate.

Cast steel anchor bases must meet ASTM A 27, Grade 65-35.

Hot rolled steel plate anchor bases must be fabricated of steel meet-ing ASTM A 36 or approved equal.

4. Bracket Arm Assembly. The bracket arm assembly must be fabri-cated from steel conforming to ASTM A 53, Grade B or ASTM A 36.The bracket arm assembly must be the truss type design.

The installed bracket arm assembly must provide a weather resistantconnection with smooth wiring raceway.

5. Welds. All welding must be done according to section 707. Theshaft may have one longitudinal welded joint and one transversewelded joint as shown on the plans.

The welded area must be free from flat spots, protuberances, cracks,discolorations, weld splatter, mill scale or any other imperfectionswhich mar the appearance or structural continuity of the weldedarea.

Any circumferential butt weld splice and the base connection weldmust be a full penetration weld and must be ground flush. Theremaining portion of the longitudinal weld may be a minimum 60percent partial penetration weld.

The base must telescope onto the shaft and be welded by two con-tinuous electric arc welds; one weld on the inside of the base atthe end of the shaft and the other weld on the outside of the shaftat the top of the base.

6. Galvanizing. Light standards and all related components must behot-dip galvanized per ASTM A 123. The bracket arm assemblymust be galvanized separately.

7. Hardware. All threaded fasteners and lockwashers used to secureparts to the shaft must be AISI Series 300 Stainless Steel.

B. Aluminum Light Standards.

1. Shafts. Aluminum shafts must be round, octaflute, or octagonal,with a uniform taper.

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The shaft must be fabricated from a single piece of seamless tubingof aluminum alloy 6063 conforming to ASTM B 221, and, afterfabrication, must have physical strength properties as prescribed forthe T6 temper.

All castings other than the shaft top must be aluminum alloy 356-T6. Shaft top must be aluminum Alloy 43F.

Sand castings must conform to ASTM B 26. Permanent mold cast-ings must conform to ASTM B 108.

2. Handhole. Each light standard must have a reinforced handhole,with a cover and a grounding nut or lug located inside the shafteasily accessible from the handhole.

3. Bracket Arm Assembly. The bracket arm assembly must be fabri-cated from aluminum alloy pipe or tapered tubes.

Pipes must conform to aluminum alloy 6063-T6 or 6061-T6 ofASTM B 241.

Tapered tubes must conform to aluminum alloy 6063-T6 or 6061-T6 of ASTM B 221.

The bracket arm assembly must be of truss type design. The in-stalled bracket must provide a weather resistant connection withsmooth wiring raceway.

4. Welds. Welding of aluminum must be done according to Section1.5.3 of the AASHTO Standard Specifications for Structural Sup-ports for Highway Signs, Luminaires and Traffic Signals.

All welding procedures must be qualified by testing qualificationwelds as required by the Engineer.

The cast aluminum anchor base must be secured to the lower endof the shaft by two continuous welds made by the metal inert-gasmethod using aluminum filler metal conforming to AWS Specifica-tion D1.2, Structural Welding Code-Aluminum.

The base must telescope onto the shaft and one weld must be onthe inside of the base at the end of the shaft, while the other weldmust be on the outside of the shaft at the top of the base.

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918.09

5. Hardware. All threaded fasteners, lockwashers, etc., used to secureparts to the shaft must be aluminum alloy 2024-T4 or AISI Series300 Stainless Steel.

C. Frangible Transformer Bases. Any frangible transformer base mustmeet the requirements for Breakaway Supports and section 7 of thecurrent AASHTO Standard Specification for Structural Supports forHighway Signs, Luminaires, and Traffic Signals.

Each frangible base must be furnished with four bolts, hex nuts, wash-ers, and lockwashers and fiberglass covers of the size shown on theplans. Tighten bolts to a snug tight condition as defined in subsection707.03.D.7.c. The bolts must conform to ASTM A 307 or equivalent.

D. Anchor Bolts. All anchor bolts and associated nuts, studs, and cou-plings must conform to subsection 908.15.

All anchor bolts must be zinc coated for a length not less than 16inches from the threaded end. All associated nuts, studs, washers, andcoupling must be hot-dipped galvanized according to ASTM A 153.

918.09 Luminaires.

A. High Pressure Sodium Luminaires. (Cobra Head Type)

1. Housing. The luminaire housing must be of cast or formed alumi-num of adequate thickness to give structural rigidity.

The housing hood must contain an integral slip fitter, suitable formounting on either a 2-inch pipe bracket or a 11⁄2-inch pipe bracket(with insert if necessary).

Mechanical means for leveling the luminaire with a minimum rangeof ± 3 degrees from the horizontal must be provided. A levelingsurface on the housing exterior must be provided for mounting theluminaire in the proper operating position.

The hinge arrangements of the refractor holding ring must allow therefractor to open at least 90 degrees from the horizontal.

The hinge must have a locking arrangement to prevent the refractorholding ring from falling.

All exterior hardware and fasteners, wholly or partly exposed, mustbe stainless steel, monel metal or aluminum alloy. The luminaire tobracket arm mounting fasteners and all internal fasteners must be

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stainless steel or zinc coated steel. All remaining internal hardwaremust be stainless steel, aluminum alloy, or zinc coated steel.

2. Reflector. The reflector must be made of aluminum with an ALGLASreflector finish or with a sealed anodic coating over either a electro-lytically or chemically brightened specular surface.

The amount of anodic coating must not be less than 4 mg/squareinch per ASTM B 137.

The coating seal must meet ASTM B 136.

The reflector must be mounted to be removed for cleaning withoutspecial tools.

The gasket material must be either ethylene-propyleneterpolymer(EPT), or a synthetic fiber felt.

3. Refractor. The refractor must be made of clear borosilicate glass.

The refractor must be compatible with the reflector to give the speci-fied light distribution.

The refractor must be securely mounted to the holding ring withprovision for easy replacement.

4. Ballast. The ballast must be of the magnetic regulator type or con-stant wattage auto regulator type.

The ballast must be mounted entirely within the luminaire housing.

The ballast must have a lamp wattage and circuit voltage clearlyidentified and must meet the current ANSI specification.

Power factor must be not less than 90 percent at rated voltage.

The ballast must provide reliable starting at -20 °F over voltagevariations of ±10 percent of nominal.

Lamp starting pulse voltage must not be greater than 4000 pulsepeak volts.

5. Lamps. Lamps must be high-pressure sodium vapor, as specifiedon the plans. High pressure sodium lamps must conform to lumi-naire design burning position requirements.

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6. Socket. The socket assembly must be of rigid construction so thatcorrect lamp position can be retained during service.

The socket material must be nickel plated brass with a porcelaincovering.

The socket must contain lamp grips and the center contact mustbe spring loaded.

The socket leads must be welded or attached with crimp type, sol-derless, compression connectors.

Socket adapters for lamp positioning must not be used. Informationon correct socket position (if variable) must be provided.

7. Wiring. All internal wiring and connection must be completed sothat it will be necessary only to attach incoming supply conductorsto pressure type connectors on a terminal block.

Heat resistant protective tips or sleeves must be furnished for the lampcords if the lamp cord connections are directly above the lamp.

The terminal block must be rated at 600 volts and meet NEMASpecifications for Wiring Terminals. The terminal board must ac-commodate crimp-on solderless compression connectors for interiorwiring.

The incoming supply conductors must be mechanically and electri-cally fastened with compression terminals to accommodate wirefrom No. 12 to No. 6 AWG.

Type FNM fuses must be furnished and be mounted as called foron the plans. The amperage rating of the fuses must be as shownin Table 918-1.

Table 918-1 High Pressure Sodium Luminaire Fuse Requirements

Luminaire Fuse Ratings, amperes

Circuit Voltage

120 240 277 480

250 W 10 5 5 5

400 W 15 10 10 10

700 W 20 10 10 10

1000 W 30 15 15 15

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B. Rectangular Luminaires. Rectangular luminaires must be as speci-fied in the contract documents.

918.10 Tower Lighting Unit. Tower lighting units must be designedaccording to the AASHTO Standard Specifications for Structural Sup-ports for Highway Signs, Luminaires and Traffic Signals. The WindImportance Factor for the design wind speed must be based on a recur-rence interval of 50 years. The alternative method for determining thewind speed is not allowed. The Fatigue Importance Factor must beCategory I. Calculations for the design of the light standard must besealed by a professional engineer licensed in the State of Michiganand submitted to the Engineer for approval.

A. Shaft and Base. The steel shaft including the base must be fabri-cated from steel meeting ASTM A 572, Grade 50, or A 607 Grade 50with a maximum silicon content of 0.060 percent for the shaft andbetween 0.150 and 0.250 percent for the base plate. All material mustbe single thickness steel plate with no laminations.

Design calculations must be based on a yield strength Fy not to exceed50,000 psi.

No section of the pole must have a wall thickness less than 3⁄16 inch.Anchor bolts, nuts and washers must be according to subsections908.15.A and B. Anchor bolt installation and tightening must be ac-cording to subsection 810.03.N.

The overall diameter of the shaft must be not less than 231⁄2 inchesat the base, with uniform taper to the top and a minimum diameter of6 inches.

Fabrication must be according to section 707, except as modified bythis subsection.

1. Handhole. Shafts must be furnished with hinged doors of the samematerial as the shafts. The door size must be 24 by 14 inch mini-mum and must be provided with a hasp, for padlock. The accessholes must be placed so they do not intersect the longitudinal seamweld on the pole.

2. Galvanizing. Poles and all related components must be hot-dippedgalvanized per ASTM A 123.

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3. Welds. Use submerged arc welding (SAW) for longitudinal seam andcircumferential welds. Circumferential seams must be full penetra-tion groove welds.

Longitudinal seams at slip joints (11⁄2 diameters) and welded spliceareas must be full penetration groove welds on both sections for adistance of 10 inches beyond the splice end.

Weld reinforcement must be ground flush on the faying surfaces inthe slip joint area for the entire length of the full penetration weld.

Longitudinal welds other than in the slip joint area must have 60percent minimum penetration.

Base plate joints must be full penetration single bevel groove weldswith reinforcing fillet welds.

The Contractor must provide non-destructive testing, as specified,on all welds. The UT and MT must be performed by personnelqualified as NDT Level II or Level III per ASNT STN-TC-1A. BothMT and UT must be witnessed by the Engineer. Certified inspectionreports from the ANST inspector must be given to the Engineer forall welds tested.

a. Magnetic Particle Testing. Magnetic particle inspection testing(MT) must be performed on all welds according to subsection707.03C.9.b.

b. Ultrasonic Testing. Full penetration groove welds must be 100percent ultrasonic tested (UT) using the shear wave or anglebeam method. UT must be according to ASTM E587-94, Stan-dard Practice for Ultrasonic Angle Beam Examination by the Con-tact Method and the American Welding Society (AWS) D1.1Structural Welding Code-Steel, except as modified herein.

The full penetration groove weld of the slip joints are to be evalu-ated by UT as cyclically loaded nontubular connections. Theserequirements set guidelines for evaluating by UT indications inmaterials thinner than 5⁄16 inch shown in Table 6.3 of the AWSD1.1. The thickness of the material and the near field of thetransducer must be established prior to the start of inspectionto assure relevant indications can be detected with repeatableresults. Flaws must be evaluated in the location of the soundpath beyond the first leg, which is required in Table 6.6 of AWSD1.1. Establishing the material thickness and near field of the

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transducer assures that near field interference is not a factor inthe testing.

Inspection test reporting must be completed using Form D-11of Annex D, AWS D1.1 or an equivalent form that contains thenecessary information for identifying and classifying indicationsfound during the inspection process.

c. Equipment and Calibration. Ultrasonic units must be of thepulse-echo type and must be capable of generating, receiving,and amplifying electrical impulses for the desired application. Allinstruments must be equipped with a decibel (dB) or attenuationcontrol and must be calibrated to assure satisfactory performancein the range of operation. Equipment qualification must be ac-cording to Section 6.24 of AWS D1.1.

The search unit (transducer) must be of the piezo-electric typecoupled to a 70 degree wedge. The angle must be verified to bewithin ± 2 degrees, prior to calibration for testing. The exit pointmust be accurately marked on the side of the transducer if differ-ent from the original exit point.

Search unit frequency must be 5.0 megahertz and the diametermust be 1⁄2 inch or less. The near field must be calculated byFormula 918-1 or 918-2.

N = (D2 x F) ÷ (4 x V) Formula 918-1

N = D2 ÷ (4 x W) in which W = V ÷ F Formula 918-2

where:N = near fieldD = transducer diameterF = frequencyV = velocityW = wavelength

Couplant must be of the glycerin type. Calibration must be per-formed with the same type couplant that will be used forinspection.

Prior to beginning the calibration procedure, the operator mustverify that the reject (clipping or suppression) controls are turnedoff. Use of the reject controls may alter the amplitude linearityof the instrument and invalidate the test results. Calibration of

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the ultrasonic equipment must be according to Section 6.25 ofAWS D1.1.

d. UT Acceptance Criteria. Ultrasonic inspections must be ac-cording to Section 6.13 of AWS D1.1. The inspection must beperformed beyond the first leg of the sound path, to avoid thenear field effects. When indications are recorded, the leg of thesound path where the signal is peaked must be noted. The soundpath, or full V-path, will be calculated using Formula 918-3

SP (FVP) = 2T Formula 918-3COS �

where :SP (FVP) = sound path (or full V-path)T = material thickness,� = wedge angle

The accept/reject criteria will be according to Table 6.3 of AWSD1.1 for 5⁄16 inch material thickness, except that the valuesshown in the table are reduced by 10 dB. The 10 dB reduction isto account for the thinner material being tested and the modifiedfrequency and diameter of the search unit.

Surface preparation must be such that the transducer can befreely manipulated through the full surface area for the soundpath to be evaluated. This may require grinding or other meansof cleaning prior to inspection. Testing procedures must be ac-cording to Section 6.26 of AWS D1.1. Attenuation must be cal-culated according to Section 6.26.6.4 of AWS D1.1. In mostcases attenuation will not be a factor, due to the short length ofthe sound path in thin materials.

4. Fabrication. Test records must be kept by the supplier and must beavailable for review upon request.

Welding of identification marks or any other stray tack welds on thepoles is prohibited.

All steel components and welds must be properly cleaned by sandblasting or other methods approved by the Engineer beforegalvanizing.

Preheat must be verified by the use of Tempil indicating crayons ordirect temperature instruments.

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B. Head Frame Assembly. The headframe assembly must provide a pairof pulleys properly located for each stainless steel cable used to supportthe luminaire ring. In addition, either a roller assembly or a singlepulley for the power cord must be provided. The hoisting system mayconsist of two or three stainless steel cables at the head frameassembly.

1. Power Cord Roller Assembly. Where a roller assembly is used tosupport the power cord, the assembly must consist of six rollersmounted between two cold-rolled steel plates which are zinc-electroplated per ASTM B 633 and yellow chromatic dipped. Thepower cord must ride on rollers made from acetate resin meetingASTM D 2133-65, Grade II mounted on AISI 304 stainless steelshafts. The six rollers must be located to support the power cord ina minimum 7 inch bending radius. All parts of the assembly mustbe fabricated from ASTM A 572 Grade 345 steel except the pulleyand rollers.

The assembly must be designed to protect all parts from theweather.

2. Power Cord Pulley. Where a pulley is used to support the powercord, it must be a minimum of 16 inches in diameter and fabricatedfrom a single piece of galvanized steel.

3. Pulleys for Stainless Steel Support Cables. Pulleys used for thestainless steel cables must have a minimum diameter of 6 inchesand be fabricated in one piece from either stainless steel or galva-nized steel.

All pulleys must have permanently lubricated bronze bearings andstainless steel axle pins. The depth of the vee on all pulleys mustnot be less than the diameter of the cable for which it is to beused and guards must be provided to prevent cables from riding offthe pulleys.

4. Latching. Provisions for latching the luminaire mounting ring maybe located at the head frame assembly or at the base of the pole.

Where latching is completed at the head frame assembly, threelatches will be an integral part of the head frame assembly. Latchingmust be accomplished by the alternate raising and lowering of theluminaire ring assembly by the winch and hoisting assembly. Allmoving parts of the latching mechanism must be attached to the

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luminaire ring assembly and serviceable at ground level. The lumi-naire ring must not move horizontally or rotate about the pole duringthe latching or unlatching process. The latching and locking of eachlatching mechanism must be signaled by indicator flags visible fromthe ground.

Where a two cable hoist system is used, latching of the luminairemounting ring will be accomplished only at the base of the pole.Each supporting cable must be latched into place by a cable anchor-ing device.

C. Luminaire Mounting Ring. The luminaire mounting ring must support2-inch diameter mounting tenons complete with ballasts, evenly dis-tributed around the ring for mounting the specified number of lumi-naires. It must provide a suitable raceway, or enclosure, for all requiredelectrical connections to the luminaires.

The mounting ring must be furnished with not less than No. 12 AWGcopper wire rated at 200 °F.

The luminaire mounting ring and related components must be fabri-cated from galvanized steel. Galvanizing must be by the hot-dip methodof ASTM A 123, after welding fabrication.

The luminaire mounting ring must be equipped with a weather proofmale receptacle for conveniently energizing the luminaires when thering is in its lowered position. Connections must be weathertight andprotected when the luminaires are in the operating position.

Provisions must be made for centering and damping any contact theluminaire mounting ring may encounter while ascending and descend-ing the pole.

Roller-contact with spring-loaded centering arms located on the lumi-naire mounting ring must be provided. The luminaire ring centeringdevice must be capable of keeping the ring approximately concentricwith the pole.

D. Luminaires for Tower Lighting. The luminaire when installed mustbe of adequate design to operate at mounting heights in excess of 100feet. It must withstand wind velocities of 120 feet per second andresulting vibrations. The luminaire must not weigh more than 94pounds. When mounted in operating position the projected area ex-posed to the wind must be not more than 5.4 square feet.

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The luminaire must meet the following requirements:

1. Housing. The luminaire housing must be cast or formed aluminumwith 0.2 percent maximum copper content and of adequate thick-ness to give structural rigidity. The housing must contain an integralslip fitter, suitable for mounting on either a 2-inch pipe bracket ora 11⁄2 inch pipe bracket (with insert if necessary). Mechanicalmeans to limit insertion of the pipe arm must be provided. Mechani-cal means for leveling the luminaire with a minimum range of ±3degree from the horizontal must be provided.

A leveling surface on the housing exterior must be provided formounting the luminaire in the proper operating position. Luminairesproducing asymmetrical light distributions must be capable of beingoriented to distribute the light as shown on the plans. All exteriorhardware and fasteners, wholly or partly exposed, must be stainlesssteel, monel metal, or aluminum alloy. The luminaire to bracketarm mounting fasteners and all internal fasteners must be stainlesssteel or zinc coated steel. All remaining internal hardware must bestainless steel, aluminum alloy, or zinc coated steel.

2. Reflector. The reflector must be aluminum or glass. The reflectormust be gasketed to the refractor or cover glass. The gasket materialmust be either extruded silicone rubber or a synthetic fiber felt.

3. Aluminum Reflector. Aluminum reflectors must be enclosed and alloptical parts must be weather tight and bugtight. The reflector mustbe made with ALGLAS reflector finish or with a sealed anodic coat-ing over an electrolytically or chemically brightened specular sur-face. The amount of coating must not be less than 4 mg per squareinch per ASTM B 137. The coating seal must meet ASTM B 136.The fabricator must submit, upon request, a certification that thereflector coating meets the above requirements.

4. Glass Reflector. Glass reflectors must be one piece clear borosilicateglass reasonably free from bubbles or ripples. The reflector backsurface must be protected against the effects of atmospheric oxida-tion and moisture.

5. Cover Glass. The cover glass if required must be made of cleartempered glass. The cover glass must be securely mounted to theholding ring with provision for easy replacement.

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The cover must be gasketed. The gasket material must be eitherethylene-propyleneteroplymer (EPT) or synthetic fiber felt.

6. Ballast. The ballast or ballast housing must be mounted on theluminaire housing and must be entirely enclosed. A gasket must beinstalled between a ballast housing and the luminaire housing. Theballast must be designed for operation at rated voltage as specifiedon the plans.

The ballast must have lamp wattage and circuit voltage clearly iden-tified as specified in ANSI C 82.4.

The ballast must be of the regulating auto-transformer type. Anapplied primary voltage change of ±10 percent of line nominal atthe ballast must cause no more than a ±13 percent change in lampwattage. Power factor must be not less than 90 percent at ratedvoltage. The ballast must provide reliable starting at temperaturesdown to -20 °F and with voltage variations as much as ±10 percentof line nominal.

7. Lamp. The lamp must be of the type and size specified on the plans.

8. Socket. The socket assembly must be of rigid construction so thatcorrect lamp position can be retained during service. Socket adapt-ers for lamp positioning must not be used. Information coveringcorrect socket position (if variable) must be provided. The socketmaterial must be nickel plated brass with a porcelain covering. Thesocket must contain lamp grips and the center contact must bespring loaded. The socket leads must be welded or attached withcrimp type, solderless, compression connectors.

9. Wiring. All internal wiring and connections must be completed sothat it will be necessary only to attach incoming supply conductorsto pressure type connectors on a terminal block. The terminal blockmust be rated at 600 volts and meet NEMA Specifications for Wir-ing Terminals. The terminal board must accommodate crimp-on sol-derless, compression connectors for interior wiring. The incomingsupply conductors must be mechanically and electrically fastenedwith compression terminals to accommodate wire from No. 12 toNo. 16 AWG.

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10. Fusing. Inline FNM type fuses must be furnished and mountedwithin the luminaire housing. The current rating of the fuses mustbe as follows:

Circuit Voltage 120 240 277 480Current Rating 30 15 15 15

11. Painting. The luminaire housing must be painted metallic gray.

12. Packaging. Luminaires must be individually packed for shipmentto ensure arrival at the project site in an undamaged condition.

13. Assembly Drawings. Assembly and installation drawings must beprovided.

14. Sampling and Testing. Certification must be provided for all towerlighting luminaires. Sampling and testing, if requested, will beaccording to Department methods, applicable standard specifica-tions and the Photometric and Electrical Test Procedures.

E. Lowering Device. Each tower lighting unit must be equipped withan electric motor mounted inside the base of the tower lighting unitand a hoisting device capable of raising the specified number of lumi-naires plus 300 pounds to the proper operating position and loweringthe luminaires to a point approximately 5 feet above the foundation.Provisions must be made so that the raising and lowering operationmay be controlled from a distance of 15 feet from the base of the pole.

The lowering device must include a worm gear, gear reducer hoist ofat least 30:1, with supporting, hoisting, and electric cables to theluminaire mounting ring.

The hoist must be mounted inside the base of the pole with stainlesssteel hardware. The hoist drum must be supplied with stainless steelcable, not less than 1⁄4-inch diameter, firmly attached to the hoist drumand long enough for at least one complete layer on the drum plus thatrequired to lower the luminaire mounting ring to its lowest position.

When a single hoisting cable is used, a cable junction plate must befurnished to join the three supporting cables to the hoisting cable andto hold the lower end of the electric cable. Such junction plate mustbe accessible through the handhole when the luminaire mounting ringis in the raised position. Provision must be made to adjust the lengthof each of the three supporting cables, by approximately 4 inches, withthe luminaire mounting frame at the top of the pole. In lieu of such

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length adjustment, provision may be made for each of the three sup-porting cables to terminate through a coil spring under compression sothat, when the luminaire mounting ring is in raised position, a differ-ence of up to 3 inches in the length of one or two of the cables canbe compensated for by differences in tension in those cables. The threesupporting cables must be stainless steel, 3⁄16-inch diameter.

F. Electric Cable. The electrical cable must be Portable Power CableType W-4 conductors, round, 600 volt, No. 8 AWG, copper consistingof 133 strands in each conductor, rated at 167 °F. The cable mustconform to ICEAS-19-81.

The same kind of cable must be used for the electric supply from thesafety switch to the terminal block in the pole and from the terminalblock to the twist loc connector. That cable must be long enough toreach through the handhole in the pole to serve as a power source forthe electric drill/motor to operate the lowering device.

Where it is attached to the cable junction, the electric cable must beheld by a strain relief grip, with an insulated compression-type connec-tor, suitable to support that cable when the luminaire mounting ring islowered. A similar strain relief grip must hold the other end of theelectric cable where it is connected to the luminaire mounting ring.

G. Lightning Arrestor. A lightning arrestor, suitable for the operatingvoltage and conditions, must be mounted inside the pole base accessi-ble through the handhole, and must be connected between the loadside of the fused safety switch and the pole grounding lug by theshortest practical connections.

H. Twist Loc Connector. The Twist Loc connector must be 600 volt,U.L. 50 amp, 3-pole, 4-wire. The power cord from the luminaire mount-ing ring must have a male plug and the supply cord must have afemale plug.

I. Electric Drill/Motor. An electric drill or motor must be used to operatethe hoisting device. The electric drill must be a 240-volt heavy dutyindustrially rated; 1⁄2-inch capacity; electrically reversible; with specialchuck to fit hoist of lowering device; with special mounting bracket forattaching to hoist through the handhole in the pole; and equipped withspecial electric cord.

Where an electric motor is used, a reversible, standard frame motorwith a magnetic brake must be used.

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Provisions must be made for mounting the drill/motor frame so that itmay be connected to the hoist without being held by any other means.The drill/motor must be cable of operating the hoist in either directionfrom this position.

The electric cord for the drill/motor must be flexible, have heavy duty600-volt insulation, and attachment plug to fit the 240-volt outlet inthe metal pull box. A momentary push button control must be provided,either in the electric cord for the drill or on a separate cord from thedrill, to permit operating the drill in either direction or stopping it whilethe operator is as far as 15 feet from the pole.

A test cable for the purpose of energizing the luminaires when theluminaire mounting ring is in its lowered position must be furnishedwith the electric drill/motor. The cable must be the same kind as theelectric cable up the pole, must have proper fittings to connect theelectric supply to the weathertight outlet in the luminaire frame andmust be long enough for that purpose.

J. Foundation. The foundation for the tower lighting unit must be builtas shown on the plans. The anchor bolts must be provided by the polemanufacturer for installation in the foundation.

Each anchor bolt must be supplied with two nuts for plumbing thepole. The upper 15 inches of the bolts and the nuts must be zinccoated according to ASTM A 153. All anchor bolts and associated nuts,washer and all hardware must conform to subsection 908.15. Anchorbolt installation must be according to section 810.

K. Fused Safety Switch. The fused safety switch must be as specifiedon the plans.

918.11 Wood Poles.

A. Furnish western red cedar, red pine or southern pine poles thatconform to ANSI Specification 5.1 and P.L.D. Specification for WoodPoles.

B. The circumferential surface area of all poles must be incised startingfrom a minimum of 24 inches below the ground line and extending toa minimum of 12 inches above the ground line. All poles must bemachine shaved full length above the incised area.

C. All poles must be treated full length according to the AWPA Stan-dard for the Preservative Treatment Wood Poles.

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D. The pentachlorophenol-petroleum preservative solution must con-form to AWPA Standards P8-64 and P9-65. The solution must containnot less than five percent of pentachlorophenol by weight.

E. Support Hardware.

1. Guys and Guy Anchors. Guy wire must be extra high strength grade7-strand. Guy anchors must be heavy two-bladed malleable ironexpansion type. Guy anchor rods must be galvanized 3⁄4 inch by 8foot thimble eye type. Anchor guys must be provided with suitablemetal or plastic guards.

2. Miscellaneous Hardware. Miscellaneous pole line hardware must behot-dip galvanized and must be standard products of electrical ma-terials manufacturers.

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