ELECTRICAL POWER
PART 1 GENERAL
1.1SECTION INCLUDES
A.Electrical power conduit, conductors, and equipment for electrical services
and feeders.
1.2RELATED SECTIONS Not Used
1.3REFERENCES
A.ASTM B 3: Soft or Annealed Copper Wire
B.ASTM B 8: Concentric-Lay-Stranded Copper Conductors, Hard, Medium-
Hard, or Soft
C.ASTM B 496: Compact Round Concentric-Lay-Stranded Copper
Conductors
D.ASTM B 800: 8000 Series Aluminum Alloy Wire for Electrical Purposes—
Annealed and Intermediate Tempers
E.ASTM B 801: Concentric-Lay-Stranded Conductors of 8000 Series
Aluminum Alloy for Subsequent Covering or Insulation
F.ASTM D 92: Flash and Fire Points by Cleveland Open Cup Tester
G.ASTM D 2241: Poly Vinyl Chloride (PVC) Pressure-Rated Pipe (SDR
Series)
H.ASTM D 2247: Testing Water Resistance of Coatings in 100% Relative
Humidity
I.ASTM F 2160: Solid Wall High Density Polyethylene (HDPE) Conduit
Based on Controlled Outside Diameter (OD)
J.American National Standards Institute (ANSI)
K.Association of Edison Illuminating Companies (AEIC)
L.Electric Utility Service Equipment Requirements Committee (EUSERC)
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M.Institute of Electrical and Electronics Engineers (IEEE)
N.Insulated Cable Engineers Association (ICEA)
O.Intertek Electrical Testing Labs (ETL)
P.National Electric Code (NEC)
Q.National Electrical Contractors Association (NECA)
R.National Electrical Manufacturers Association (NEMA)
S.National Fire Protection Association (NFPA)
T.State of Utah Administrative Rule R930-7 – Accommodation of Utilities
and the Control and Protection of State Highway Rights of Way
U.Underwriters Laboratories (UL)
V.Western Underground Committee Guides
1.4DEFINITIONS Not Used
1.5SUBMITTALS
A.Manufacturer’s product data sheets and installation instructions for
information for the following products:
1.Conduit
2.Power and grounding conductors
3.Disconnect switches
4.Panelboards
5.Dry type transformers
6.Pad mounted oil filled transformers
7.Electrical service equipment
8.Medium voltage cables
9.Medium voltage terminations
B.Test results for information. Refer to this Section, Article 3.8.
C.Manufacturer’s warranties and guarantees for information before
substantial completion.
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1.6QUALITY ASSURANCE
A.Electrical components must be listed and labeled as defined in the NEC
by a nationally recognized testing agency and must be marked for intended use.
B.A Master or Journeyman Electrician licensed in the State of Utah must
supervise and be responsible for all onsite work related to this Section.
C.Comply with NFPA 70 (NEC).
PART 2 PRODUCTS
2.1CONDUCTORS RATED 600 V AND LESS
A.Material: Stranded copper unless stranded aluminum conductors are
specifically identified.
1.Copper: Single conductor, soft drawn complying with NEMA
WC70/IECAS-95-658, ASTM B 3 and ASTM B 8.
2.Aluminum: Series 8000, single conductor complying with NEMA
WC70/IECAS-95-658, ASTM B 800 and ASTM B 801.
a.Do not use aluminum conductors in any traffic signal circuits.
B.Insulation: 90 degrees C, wet location, cross linked polyethylene, USE-
2/RHW-2; resistant to oil, gasoline and sunlight.
C.Provide conductor sizes as shown with the following minimum sizes:
1.10 AWG copper conductor.
2.6 AWG aluminum conductor.
2.2MEDIUM VOLTAGE CABLES
A.Cable type: MV105 complying with UL 1072, AEIC CS 8, NEMA
WC74/ICEAS-93-639, ICEAS-97-682, ASTM B 8 and ASTM B 496.
B.Conductor material: stranded copper, compact round, concentric lay,
Class B.
C.Insulation: Ethylene-propylene rubber with the following characteristics:
1.5kV or 15kV voltage rating as shown
2.133 percent insulation level
3.Ethylene content of the elastomer used in the insulation compound
not exceeding 72 percent by weight
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4.Polyethylene free insulation compound
5.5-mil copper tape shielding helically applied over semiconducting
insulation shield with minimum 12.5 percent overlap wrap
6.Sunlight-resistant PVC cable jacket
2.3GROUNDING CONDUCTORS
A.Material: Stranded copper unless stranded aluminum conductors are
specifically identified.
1.Copper: Single conductor, soft drawn complying with NEMA
WC70/IECAS-95-658, ASTM B 3 and ASTM B 8.
2.Aluminum: Series 8000, single conductor complying with NEMA
WC70/IECAS-95-658, ASTM B 800 and ASTM B 801.
a.Do not use aluminum conductors in any traffic signal circuits.
B.Insulation: 90 degrees C, wet location, cross linked polyethylene, USE-
2/RHW-2; resistant to oil, gasoline and sunlight.
C.Provide conductor sizes as shown with the following minimum sizes:
1.10 AWG copper conductor.
2.6 AWG aluminum conductor.
2.4GROUND RODS
A.Provide copper clad steel ground rods of 3/4 inch diameter by 10 ft long.
1.Ground Rod Clamps: Bridgeport IGBC075 or equivalent.
2.5CONDUIT
A.Schedule 40 PVC, type EPC-40, rated for use with 90 degrees C
conductors. Comply with NEMA TC-2, ASTM D 2241, UL 651 Listed.
1.Fittings complying with NEMA TC-3.
B.Schedule 80 PVC, type EPC-80, 90 degrees C rated. Comply with NEMA
TC-2, ASTM D 2241, UL 651 Listed.
1.Fittings complying with NEMA TC-3.
C.Schedule 40 High Density Polyethylene (HDPE), type EPEC-40,
smoothwall, 90 degrees C rated. Comply with ASTM D 2247, ASTM F 2160, NEMA TC-7; Intertek ETL Listed to UL 651.
D.Schedule 80 High Density Polyethylene (HDPE), type EPEC-80,
smoothwall, 90 degrees C rated. Comply with ASTM D 2247, ASTM F 2160, NEMA TC-7; Intertek ETL listed to UL 651.
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E.Rigid Metal Conduit (RMC) complying with UL-6. Zinc galvanized exterior
coating complying with ANSI C80.1.
F.Liquidtight Flexible Metal Conduit (LFMC), -30 degrees C to 80 degrees C
rated, UL 360 listed.
G.Liquidtight Flexible Nonmetallic Conduit (LFNC), 80 degrees C dry, 60
degrees C wet rated, sunlight resistant, UL 1660 listed.
2.6TERMINATION CONNECTIONS
A.Wet location connectors
1.Supply multiport submersible connectors.
a.Ethylene propylene diene monomer rubber insulated, AL/CU
and submersion rated.
b.Tested to ANSI 119.1, ANSI 119.4 and Western
Underground Committee Guide 2.5.
c.Port quantity and conductor size range matching
requirements at each application location.
2.Heat shrink tubing: Thick wall polyolefin tubing with factory applied
heat activated adhesive, 3:1 shrink ratio, UL 486D listed.
B.Dry location connectors
1.Twist on type wire connectors listed to UL 486C may be used on
AWG 8 and smaller conductors.
2.Insulated multiport mechanical connectors.
a.Aluminum alloy connector block ratedAL/CU with port
quantity and entry configuration to match location requirements.
3.Vinyl electrical tape: 8.5 mil, UL 510 listed vinyl electrical tape.
2.7MEDIUM VOLTAGE TERMINATIONS
A.Solid terminations: Comply with the following classes of IEEE 48.
Insulation class is equivalent to that of cable.
1.Include shield ground strap for shielded cable terminations.
2.Class 1 terminations: modular type, furnished as a kit, with stress-
relief tube; multiple, molded-silicone rubber, insulator modules; shield ground strap; and compression-type connector.
3.Class 1 terminations: heat-shrink type with heat-shrink inner stress
control and outer nontracking tubes; multiple, molded, nontracking skirt modules; and compression-type connector.
4.Class 1 terminations: modular type, furnished as a kit, with stress-
relief shield terminator; multiple-wet-process, porcelain, insulator modules; shield ground strap; and compression-type connector.
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B.Separable insulated connectors: modular system, complying with IEEE
386, with disconnecting, single-pole, cable terminators and with matching, stationary, plug-in, dead-front terminals designed for cable voltage and for sealing against moisture.
1.Terminations at distribution points: modular type, consisting of
terminators installed on cables and modular, dead-front, terminal junctions for interconnecting cables.
2.Load-break cable terminators: Elbow-type units with 200-A load
make/break and continuous-current rating; coordinated with insulation diameter, conductor size, and material of cable being terminated.
a.Include test point on terminator body that is capacitance
coupled.
3.Dead-Break Cable Terminators: Elbow-type unit with 600-A
continuous-current rating; designed for de-energized disconnecting and connecting; coordinated with insulation diameter, conductor size, and material of cable being terminated.
a.Include test point on terminator body that is capacitance
coupled.
2.8DISCONNECT SWITCHES
A.Fusible switches
1.Type HD, heavy duty, single throw, UL 98 and NEMA KS 1, with
clips or bolt pads to accommodate indicated fuses, lockable handle, and interlocked with cover in closed position.
2.Internally mounted grounding and insulated neutral buses labeled
for copper and aluminum ground conductors.
3.NEMA 250 Type 3R enclosure rating.
B.Nonfusible switches
1.Type HD, heavy duty, single throw, UL 98 and NEMA KS 1,
lockable handle, and interlocked with cover in closed position.
2.Internally mounted grounding and insulated neutral buses labeled
for copper and aluminum ground conductors.
3.NEMA 250 Type 3R enclosure rating.
C.Enclosed Molded Case Circuit Breakers
1.Comply with UL 489, NEMA AB 1, and NEMA AB 3, with
interrupting capacity to comply with available fault currents.
2.Thermal-Magnetic trip unit with inverse time-current element for
low-level overloads and instantaneous magnetic trip element for short circuits.
3.Internally mounted grounding and insulated neutral buses labeled
for copper and aluminum ground conductors.
4.NEMA 250 Type 3R enclosure rating.
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2.9PANELBOARDS
A.Feeder and branch circuit panelboards: comply with NEMA PB-1.
1.Phase, neutral, and ground buses made of hard-drawn copper, 98
percent conductivity.
2.Equipment ground bus sized adequately for feeder and branch-
circuit equipment grounding conductors; bonded to box.
3.NEMA 250 Type 3R enclosure rating.
B.Main overcurrent protective device: Bolt on molded case circuit breaker,
complying with UL 489, NEMA AB 1, and NEMA AB 3, with 10kA minimum interrupting capacity or higher as needed for the available fault current.
1.Thermal-Magnetic trip unit with inverse time-current element for
low-level overloads and instantaneous magnetic trip element for short circuits.
C.Branch circuit overcurrent protective devices: Bolt-on circuit breakers,
AL/CU rated, replaceable without disturbing adjacent units.
1.Comply with UL 489, with 10kA minimum interrupting capacity or
higher as needed for the available fault current.
2.10DRY TYPE TRANSFORMERS
A.Comply with NEMA ST 20, listed and label as complying with UL 1561.
B.Coil Material: Resin encapsulated copper or aluminum.
C.Enclosure: NEMA 250 Type 3R, fully enclosed, non-ventilated.
D.Insulation Class: 180 degrees C, UL-component-recognized insulation
system with a maximum of 115 degrees C rise above 40 degrees C ambient temperature.
E.Primary and secondary voltage as shown.
2.11PAD MOUNTED OIL FILLED TRANSFORMER
A.Description: ANSI C57.12.00, ANSI C57.12.13, IEEE C57.12.25, pad-
mounted, 2-winding transformers.
1.Stainless-steel tank base and cabinet.
B.Coil Material: Copper.
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C.Insulating Liquid: Less flammable, edible-seed-oil based and UL listed as
complying with NFPA 70 requirements for fire point of not less than 300 degrees C when tested according to ASTM D 92.
1.Biodegradable and nontoxic.
D.Temperature Rise: 65 degrees C when operated at rated kVA output in a
40 degrees C ambient temperature.
E.Basic Impulse Level: 95 kV.
F.Full-Capacity Voltage Taps: Four 2.5 percent taps, 2 above and 2 below
rated high voltage; with externally operable tap changer for de-energized use.
G.Equipment support pad – Refer to SL Series Standard Drawings.
2.12HIGHWAY LIGHTING ELECTRICAL SERVICE
A.General Requirements
1.Provide product manufactured by one of the following:
a.Milbank Manufacturing Co.
b.Myers Power Products
c.Cooper Industries
d.Approved equal product.
2.Metered power pedestal with base, NEMA 3R cabinet with gasket
sealed access doors fabricated of 0.120 inch minimum thickness anodized aluminum.
a.Continuously welded exterior cabinet and door seams with
smooth seams and free of any voids.
b.Design to be bolted down to a concrete foundation or pad
from the inside of the pedestal.
3.Cabinet height 54 inches maximum.
4.Provide service entrance, meter, and distribution compartments
separated by corrosion resistant barrier.
5.Provide compartment access doors with stainless steel piano
hinges with hinges on left as viewed facing the cabinet.
6.Provide provision for padlock.
7.Design cabinet openings including ventilation holes to prevent
entrance of insects such as wasps, hornets, bees, and varmints when access panel and doors are closed.
a.Install a permanent welded insect screen on ventilation
holes.
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8.Provide sealed windows made of shatter resistant polycarbonate
for photocell operation.
a.Provide two windows and mounting brackets on opposite
sides of the cabinet for the photocell.
b.Locate the windows on the sides of the cabinet.
9.UL 508 listed.
10.Provide pedestal documentation permanently attached to the inside
of the distribution section.
11.Provide interior and exterior labels etched or engraved and
mechanically fastened to the cabinet.
a.Adhesives are not acceptable.
b.Label front exterior of the cabinet “UDOT LIGHTING
DISCONNECT.”
12.Minimum 6 inches of free space between pad and any electrical
components for routing conductors.
B.Electrical Requirements
1.Rated for 200 amp, 1-phase, 3-wire, 120/240V or 240/480V service
as shown.
a.200 amp utility landing lugs rated for copper and aluminum
conductors, sized to accommodate up to 250 kCMIL wire.
b.Self-contained utility watt-hour meter socket with manual link
bypass. 1) Comply with local power utility company requirements.
c.Bolt on 200-amp, 2-pole main circuit breaker.
d.12 circuit panel board interior.
e.Lighting contactors, electrically held, 30-amp, 2-pole, rated
for No. 2 AWG wire. 1) Provide one contactor per lighting circuit.
f.Pre-wired photocell socket and 12 year warranty photocell
module.
g.Test switch with Hand-Off-Auto settings.
h.Circuit terminal bar with lugs rated for wire sizes #6 to #0
AWG.
i.Grounding terminal bar with lugs rated for #6 AWG wire size,
adjacent to circuit terminal bar.
j.Position circuit and grounding terminal bars to be lowest
electrical component and a minimum 12 inches from the cabinet mounting pad.
2.Pre-wired complying with NEC and NEMA requirements using UL
listed copper XHHW-2 or UL listed equivalent cable bussing, fully rated.
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3.UL listed, bolt-on circuit breakers, AL/CU labeled, industrial grade.
a.Rated for available short circuit current with minimum
interrupting rating of 10k AIC for 240V and 14k AIC at 480V.
4.Comply with EUSERC requirements for all mounting hardware and
installation details.
2.13TRAFFIC SIGNAL ELECTRICAL SERVICE
A.Refer to SL Series Standard Drawings.
B.Provide underground service pedestal manufactured by one of the
following:
1.Milbank Manufacturing Co.
2.Myers Power Products
3.Cooper Industries
4.Approved equal product.
C.Underground Service Pedestal General Requirements
1.Provide enclosures to the following limiting dimensions.
a.Enclosure height: 54 inch maximum.
b.Enclosure width, for dual meter pedestals: 24 inch minimum
2.Provide weatherproof, NEMA 3R enclosure.
3.Provide enclosure constructed of 0.125 inch anodized aluminum
5052-H32 continuously welded or overlapped, including carriage- bolted exterior and door seams, smooth and free of any voids.
4.Design enclosure openings, such as ventilation holes, to prevent
entrance of varmints and insects such as wasps, hornets, and bees when access panel and doors are closed.
a.Install a permanent, welded insect screen over
ventilation holes.
5.Provide adequate clearances inside the enclosure for pulling and
connecting to service and distribution (field) wiring with conduits extending (2 inches maximum) into the enclosure.
6.Provide sealed shatter-resistant and UV-resistant polycarbonate
windows for meter reading and photocell operation.
a.Equip meter window on front of pedestal.
b.Equip photocell headlight shield that will not affect
normal operation nor will harbor nesting insects.
7.Provide service entrance, meter, and distribution compartments
with padlockable, vandal-resistant doors and covers, and corrosion- resistant barriers separating each compartment.
a.Design compartments for safety and ease of
maintenance.
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b.Design hinge access panels and doors with stainless
steel piano hinges on access panel or access door. 1) Place hinges on left side of door when facing the pedestal.
8.Fasten enclosure directly to pad-mount base encased in concrete,
with option for attachment to anchor bolts. Secure all mounting bolts from inside the enclosure.
9.Mechanically fasten permanent etched or engraved labels to the
enclosure. Adhesives are not acceptable.
a.Label Exterior of front door “UDOT SIGNAL AND
LIGHTING DISCONNECT.”
10.Conform to UL508 Industrial Control Panel Labels for service
entrance equipment requirements.
11.Provide generator input inlet as shown.
a.Equip inlet with 30A, 125VAC, 2-pole, 3-wire, and twist-lock
flanged inlet type L5-30P with weatherproof padlockable cover to be used for generator attachment during power outages.
12.Attach documentation permanently and conveniently to the inside of
the distribution section or a permanently attached interior documentation storage pocket or pouch.
a.Include the manufacturer’s name, address, phone
number, a wiring diagram, date of manufacture, and all necessary information to order an identical pedestal and replacement parts in the documentation.
D.Electrical Requirements
1.Provide single-phase, 3-wire, 120V/240V, 100A service.
2.Provide utility terminations rated for 200A and lugs sized for 250
kCMIL wire with self-contained watt-hour meter sockets, main service disconnect, and meter bypass switch.
a.Meet local power utility company requirements.
b.Provide one meter socket for signal side on single
meter pedestals.
c.Provide two meter sockets – one for signal side and one
for lighting side – on dual meter pedestals. Label each socket “SIGNAL” and “LIGHTING” accordingly.
d.Provide adequate space for a meter puller.
3.Provide electrical components rated for temperatures between -30
degrees F and 130 degrees F.
4.Meet EUSERC requirements for all mounting hardware and
installation details.
5.Provide plug in circuit breakers that are UL approved, industrial
grade, and rated for 10K AIC minimum or higher as required for available fault current.
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6.Meet Signal Side Requirements:
a.Provide double pole 70-amp main plug-in circuit breaker
labeled “Signal Main.”
b.Provide one single-pole 30-amp plug-in circuit breaker
labeled “Traffic Signal,” secondary to the Signal Main breaker.
c.Provide capacity for 4 single pole plug-in circuit
breakers, also secondary to Signal Main breaker.
d.Provide surge protection device with status LED: 150
volt MCOV, 10 kA Nominal Discharge Current, 25 kA SCCR.
e.Provide (if generator input inlet is equipped): Pre-wired
30-amp generator input bypass, rotary cam transfer switch, with exterior generator twistlock plug L5-30P for use during power outage. Label transfer switch settings “LINE” and “GEN.” Feed the generator bypass through the signal side of the breaker panel only.
7.Meet Lighting Side Requirements:
a.Provide double Pole 70-amp main plug-in circuit breaker
labeled “Lighting Main.”
b.Provide double pole 30-amp (120/240 volt) plug-in
circuit breaker labeled “lighting,” plus breaker for photo control, both secondary to the Lighting Main breaker.
c.Provide pre-wired 30-amp 120V electrically-held 2-pole
contactor.
d.Provide three-position rotary test switch with “On-Off-
Auto” settings, clearly labeled.
e.Provide minimum capacity for (4) four double-pole circuit
breakers.
f.Provide circuit terminal bar with lugs rated for wire sizes
6 AWG to 1/0 AWG, labeled “Lighting Circuit.” Grounding terminal bar with lugs rated for 6 AWG to 1/0 AWG wire size, adjacent to circuit terminal bar.
g.Provide prewired photocell socket with minimum 12-year
warranty, long-life photocell.
2.14ITS ELECTRICAL SERVICE
A.General Requirements
1.Provide product manufactured by one of the following:
a.Millbank Manufacturing Co.
b.Myers Power Products
c.Cooper Industries
d.Approved equal product.
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2.Metered power pedestal with base, NEMA 3R cabinet with gasket
sealed access doors fabricated of 0.120 inch minimum thickness anodized aluminum.
a.Continuously welded exterior cabinet and door seams with
smooth seams and free of any voids.
b.Design to be bolted down to a concrete foundation or pad
from the inside of the pedestal.
3.Cabinet height 54 inches maximum.
4.Provide service entrance, meter, and distribution compartments
separated by corrosion resistant barrier.
5.Provide compartment access doors with stainless steel piano
hinges.
a.Hinges on left as viewed facing the cabinet.
6.Provide provision for padlock.
7.Design cabinet openings including ventilation holes to prevent
entrance of insects such as wasps, hornets, bees, and varmints when access panel and doors are closed.
a.Install a permanent welded insect screen on ventilation
holes.
8.UL 508 listed.
9.Provide sealed shatter-resistant and UV-resistant polycarbonate
windows for meter reading on front of meter pedestal.
10.Provide pedestal documentation permanently attached to the inside
of the distribution section.
11.Provide interior and exterior labels etched or engraved and
mechanically fastened to the cabinet. Adhesives are not acceptable.
a.Label front exterior of the cabinet “UDOT ITS
DISCONNECT.”
B.Electrical Requirements
1.Rated for 100-amp, 1-phase, 3-wire, 120/240V service.
a.200 amp utility landing lugs to accommodate up to 250
kCMIL wire rated for copper and aluminum conductors.
b.Main breaker: bolt on 100-amp, 2-pole.
c.12 circuit panel board interior.
2.Pre-wired complying with NEC and NEMA requirements using UL
listed copper XHHW-2 or UL listed equivalent cable bussing, fully rated.
3.Circuit breakers: UL listed, plug-in, AL/CU labeled, industrial grade,
and rated for available short circuit current with minimum interrupting rating of 10k AIC at 240V.
4.Meet EUSERC requirements for all mounting hardware and
installation details.
5.Fit with EUSERC approved power meter base with manual link
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2.15CONDUCTOR IDENTIFICATION MATERIALS
A.Colored, 7 mil thickness, self-adhesive vinyl electrical tape complying with
UL 510.
B.Polyethylene or weather resistant nylon 6.6 flag or wrap type cable
marker.
1.Tag area is markable with manufacturer’s permanent marker or
machine printed, laminated label.
PART 3 EXECUTION
3.1INSTALLATION STANDARDS
A.Comply with NFPA 70 (NEC).
3.2PREPARATION
A.Comply with local power utility requirements.
1.Contact power utility at least 60 days before the connection date
and verify the exact location, voltage, procedure, and materials required by the power utility.
3.3TRENCHING AND DIRECTIONAL BORING FOR CONDUIT
A.Trenching Paved Asphalt Surface
1.Do not use backhoe.
2.Make the trench 6 inches wide or less.
3.Use flowable fill to within 3 inches of the existing roadway surface
unless otherwise specified.
4.Apply tack coat evenly before final backfill when placing Asphalt
Mix.
5.Match the composition, density, and elevation within ± 3/16 inch of
the existing pavement section.
B.Trenching Unpaved Surface
1.Use backfill that matches the composition, density, and elevation
within ± 3/16 inch of the existing surface.
2.Install conduits that cross finished curbs and gutters, sidewalks,
concrete flatwork, textured or decorative surfaces by jacking, drilling, or pushing.
3.Dispose of surplus material promptly.
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C.Minimum Conduit Cover
1.Traffic Signals and Highway Lighting
a.Refer to SL Series Standard Drawings.
2.All others
a.Refer to AT Series Standard Drawings.
b.Refer to Utah Administrative Rule R930-7
D.Directional Boring
1.Directional boring is an approved alternative to trenching unless
otherwise specified.
2.Immediately contain, remove, and properly dispose of all drilling
fluid outside the bore.
3.4INSTALL CONDUIT
A.Use rigid metal conduit or Schedule 80 PVC conduit for above ground
application.
1.Liquidtight Flexible Metal Conduit or Liquidtight Flexible Non-
Metallic Conduit is permitted in lengths not exceeding 6 ft where not subject to physical damage.
2.Apply corrosion protection to any portion of rigid metal conduit
buried in the ground or encased in concrete.
B.Use PVC or HDPE conduit for underground application.
C.Install a bushing or bell end adapter at ends of all conduit.
D.Seal uncapped conduit ends inside junction box
1.Conduit 2 inches and smaller: Seal with at least 2 inches of duct
caulking or PVC cap.
2.Conduit larger than 2 inches: Seal with duct plug or PVC cap.
E.Do not use a torch for bending or shaping PVC conduit.
1.Use equipment specifically designed to heat PVC conduit to shape
any required curves or radii.
F.Use couplers specifically designed to couple PVC conduit to HDPE
conduit.
G.Install weatherproof junction box with breakaway receptacle or fuse holder
at breakaway structures.
H.Do not exceed 270 degrees of conduit sweeps between individual junction
boxes.
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I.Route conduit entering junction boxes to enter on the narrow side at an
angle perpendicular to the box.
1.Run conduit to the junction box by the most direct route, using the
fewest bends possible.
3.5INSTALL CONDUCTORS
A.Verify conduit is clean, dry, and free of dirt and debris before installing
conductors.
B.Use conductor manufacturer approved pulling compound or lubricant
where necessary.
1.Compound used must not deteriorate conductor or insulation.
C.Do not exceed manufacturer's recommended maximum pulling tensions.
D.Install equipment grounding conductor in all conduits.
1.Copper grounding conductors must run continuously between and
be bonded to ground rods in each junction box.
2.Aluminum grounding conductors must run continuously between
junction boxes, and be bonded to the ground rod in each junction box using a 48 inch insulated copper pigtail conductor.
a.Match copper pigtail gauge to aluminum grounding
conductor gauge.
E.Install conductors from source to load in continuous lengths without
splicing.
F.Terminate conductors.
1.Use wet location connectors in wet locations including all
underground and in-ground locations.
2.Dry location twist type connectors may be used in dry above
ground locations.
3.Do not use vinyl electrical tape as the sole means of insulating a
connection or connector.
G.Identify each conductor by circuit, phase, voltage, source and load.
1.Conductors 6 AWG and smaller must have continuous outer
insulation color complying with NEC requirements.
2.Conductors 4 AWG and larger may be identified by use of colored
phase tape at all junction boxes and terminations.
3.Group all conductors of each circuit using wrap around or flag type
cable markers.
a.Identify source and load location by description and
milepost.
b.Do not use Station Numbers to describe location.
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H.Leave 6 ft of slack conductor measured from the opening of each junction
box that the conductor passes through.
I.Make aluminum conductor connections in accordance with NECA 104.
J.Neatly arrange and support conductors within cabinets, junction boxes,
and fixtures.
3.6GROUNDING AND BONDING
A.Bond equipment grounding conductors to ground rods, metal equipment
enclosures, metal poles and ground busses.
1.Comply with NEC Article 250 requirements.
B.Bond neutral conductors to metal equipment enclosures and equipment
grounding conductors only at electrical service equipment and at transformer secondary terminals and other separately derived systems.
1.Comply with NEC Article 250 requirements.
C.Install concrete encased electrodes where shown and as required by the
NEC. Bond existing concrete encased electrodes such as pole anchor bolts to metal pole or equipment enclosures and equipment grounding conductor.
1.Concrete encased electrode consists of: Conductive metal in
structure foundation encased by at least 2 inches of concrete where foundation is in direct contact with the earth. Use one of the following conductive metal elements:
a.4 AWG bare copper conductor, 20 ft minimum length.
b.Bare or zinc galvanized steel reinforcing bars or anchor
bolts, 1/2 inch minimum diameter; 20 ft total length. 1) Connect lengths of bar together with steel tie wires to meet total length requirement. 2) Epoxy coated reinforcing bar may not be used as part of the grounding electrode.
c.No additional conductive metal is required in the concrete
foundation where anchor bolts or other conductive metal satisfies requirements above.
D.Install ground rods where shown and as required by the NEC.
1.Drive ground rods until tops are 2 inches below final grade at
services and separately derived systems.
2.Install ground rod to extend a minimum of 4 inches and a maximum
of 6 inches above box floor in junction boxes.
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3.Space ground rods minimum of 6 feet apart where multiple rods are
shown or are required by the NEC.
4.Provide 48 inch copper jumper from ground rod to aluminum
equipment grounding conductor.
3.7INSTALL DISCONNECTS, PANELBOARDS AND TRANSFORMERS
A.Install equipment level and plumb. Securely mount equipment to support
frames.
B.Install rain shields and verify drain openings are unblocked.
C.Close and seal any unused openings.
D.Install fuses in fusible devices.
E.Provide and install one-time use locks on all lockable equipment.
1.Install State furnished padlocks where provided.
3.8TESTING
A.After installation but before terminating test each conductor for insulation
integrity to adjacent conductors and ground using 1000VDC megohmmeter.
1.Record insulation resistance in megohms after 30 seconds and 60
seconds (R30 and R60).
2.Calculate polarization index by dividing the 60 second resistance by
the 30 second resistance (R60 / R30).
3.Replace any conductors with a polarization index value less than
1.4.
B.Measure transformer secondary voltage while loaded to final load and
record voltage and submit for information.
C.Record insulation test resistance values, polarization index and
transformer voltage measurements and submit for information.
END OF SECTION
Electrical Power
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1306–1323 of 1,331.
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