CONDUIT

Materials

• rigid metal (RM) conduit that is hot-dip galvanized inside and outside with a minimum of 1.5 oz. per square foot of a zinc coating

• electrical metallic tubing (EMT) and intermediate metal conduit (IMC) that is steel, galvanized on the outside, and protected on the inside with a suitable corrosion-resistant material;

• polyvinyl chloride (PVC) conduit that meets the requirements of NEMA Standard TC-2, UL 651, and the NEC;

• high-density polyethylene (HDPE) conduit without factory-installed conductors that meets the requirements, “Duct Cable”; or

• flexible conduit that is liquid-tight. Furnish conduit from new materials that comply with DMS-11030, “Conduit.” Provide conduit from manufacturers prequalified conduit manufacturers.
Unless otherwise shown on the plans, fabricate fittings such as junction boxes and expansion joints from a material similar to the connecting conduit. Use watertight fittings. Do not use set screw and pressure-cast fittings. Steel compression fittings are permissible. When using HDPE
conduit, provide fittings that are UL-listed as electrical conduit connectors or thermally fused using an electrically heated wound wire resistance welding method. Use red 3-in. 4-mil polyethylene underground warning tape that continuously states “Caution Buried Electrical Line Below.”

Construction.

Place conduit in accordance with the lines, grades, details, and dimensions shown on the plans or as directed. Install conduit a minimum of 18 in. deep underground unless otherwise shown on the plans. Meet the requirements of the NEC when installing conduit. Secure and support conduit placed for concrete encasement in such a manner that the alignment will not be disturbed during placement of the concrete. Cap ends of conduit and close box openings before concrete is placed. Ream conduit to remove burrs and sharp edges. Use a standard conduit cutting die with a 3/4-in. taper per foot when conduit is threaded in the field. Fasten conduit placed on structures with conduit straps or hangers shown on the plans or as directed. Fasten conduit within 3 ft. of each box or fitting and at other locations shown on the plans or as directed. Use metal conduit clamps that are galvanized malleable or stainless steel unless otherwise shown on the plans. Use 2-hole type clamps for 2-in. diameter or larger conduit. Fit PVC and HDPE conduit terminations with bushings or bell ends. Fit metal conduit terminations with a grounding type bushing, except conduit used for duct cable casing that does not terminate in a ground box and is not exposed at any point. Conduit terminating in threaded bossed fittings does not need a bushing. Prior to installation of conductors or final acceptance, pull a spherical template having a diameter of at least 75% of the inside diameter of the conduit through the conduit to ensure that the conduit is free from obstruction. Cap or plug empty conduit placed for future use. Perform trench excavation and backfilling as shown on the plans or as directed, “Excavation and Backfill for
Structures.” Excavation and backfilling will be subsidiary to the installation of the conduit.
Jack and bore as shown on the plans or as directed,  “Jacking, Boring, or Tunneling Pipe.”
Place warning tape approximately 10 in. above trenched conduit. Where existing surfacing is removed for placing conduit, repair by backfilling with material equal in composition and density to the surrounding areas and by replacing any removed surfacing, such as asphalt pavement or concrete riprap, with like material to equivalent condition. Mark conduit locations as directed. Conduit (when required); furnishing and installing fittings, junction boxes, and expansion joints; and equipment, labor, tools and incidentals.

 

ELECTRICAL CONDUCTORS

Materials

Provide new materials that comply with the details shown on the plans and the requirements of this Item. Use stranded insulated conductors that are rated for 600 volts; approved for wet locations; and marked in accordance with UL, NEC, and CSA requirements. Furnish electrical conductors in accordance with DMS-11040, “Electrical Conductors.” Ensure that all grounding conductors size AWG No. 8 and larger are stranded, except for the grounding electrode conductor, which will be a solid conductor.

Use white insulation for grounded (neutral) conductors, except that grounded conductors AWG No. 8 and larger may be black with white tape marking at every accessible location. Do not use white insulation or marking for any other conductor except control wiring specifically shown
on the plans. Ensure that insulated grounding conductors are green except that insulated
grounding conductors AWG No. 8 and larger may be black with green tape marking at every accessible location. Do not use green insulation or marking for any other conductor except control wiring specifically shown on the plans.

Construction

Splice conductors only in junction boxes, ground boxes, and transformer bases, and in poles and structures at the hand holes. Splice as shown on the plans. Do not exceed the manufacturer’s recommended pulling tension. Use lubricant as recommended by the manufacturer. Install conductors in accordance with the NEC. Make insulation resistance tests on the conductors prior to making final connections, and ensure that each continuous run of insulated conductor has
a minimum DC resistance of 5 megohms when tested at 1,000 volts DC. Replace conductors exhibiting an insulation resistance of less than 5 megohms.

 

DUCT CABLE

Description

Furnish and install duct cable consisting of a complete assembly of conductors enclosed in a high-density polyethylene duct.

Materials

Provide new materials that comply with the details shown on the plans, with conductors that meet the material requirements Furnish duct cable from new materials that comply with DMS-11060, “Duct Cable.” Provide duct cable from manufacturers prequalified Furnish duct that is clearly and durably marked at maximum 10-ft. intervals with the material designation including nominal size of the duct and either the name or the trademark of the manufacturer. Mark the duct at 2-ft. intervals with sequential numbers indicating length of cable, in feet, on reel,
with zero mark at the inner end.

Assemblies exhibiting evidence of conductors pulled into the duct after the duct is manufactured are not acceptable. Duct cable testing less than 50 megohms insulation resistance at 1,000 volts while still on the reel is not acceptable.

Ensure that the complete assembly is packaged on reels having sufficient diameter to prevent permanent set or damage to the duct cable. Ensure that each reel is clearly and durably marked to show the voltage rating, type of insulation, number of conductors, conductor size, length, duct size, and either the name or the trademark of the manufacturer. Before installation, furnish written certification that all duct cable complies with the requirements of this Item and as shown on the plans.

Construction

Install duct cable by open trench methods in accordance with the NEC, except at locations where installing duct cable in conduit. Backfill the trench in accordance , “Excavation and Backfill for Structures. When removal of existing pavement or concrete surface is allowed, backfill with
material equal in composition and density to the surrounding area and replace removed surfacing, such as asphalt pavement or concrete riprap, with like material to equivalent condition or as shown on plans. Splicing the duct is not allowed. Make all connections in ground boxes or pole bases. Form bends with large radii to provide free movement of conductors. After installation, demonstrate that the conductors can move freely. Duct cable that has been kinked or in which the conductors cannot move freely is not acceptable. Splice conductors and test insulation in
accordance with , “Electrical Conductors

GROUND BOXES

Description

Construct, furnish, and install ground boxes complete with lids.

Construction and Materials

Provide new materials that comply with the details shown on the plans and meet the following requirements:

• Construct cast-in-place concrete ground boxes and aprons in
• Provide fabricated precast polymer concrete ground boxes, and precast concrete ground boxes that comply with DMS-11070, “Ground Boxes.”
• Construct a concrete apron, when shown on the plans, Provide ground boxes from anufacturers prequalified  ground box manufacturers. backfilling; constructing, furnishing, and installing the ground boxes and concrete aprons when required; and equipment, labor, materials, tools, and
incidentals.

ELECTRICAL SERVICES

Description

• Installation. Furnish and install complete and independent points of electrical service.
• Removal. Remove electrical services.

Materials - Provide materials that comply with the details shown for the installation of electrical services, use new materials that meet the requirements of the NEC, UL, CSA, and NEMA, and that comply with DMS-11080, “Electrical Services.” Furnish electrical services from manufacturers prequalified  electrical service manufacturers.

Construction - Perform work in accordance with the details shown on the plans and the requirements.

A. Installation - Ensure components of the electrical service meet the requirements of the Electrical Detail Standards. Follow NEC and local utility company requirements when installing the electrical equipment. Coordinate the utility companies’ work for providing service.
B. Removal - Coordinate removal with the appropriate utility company before beginning work. Before the removal of the electrical service, disconnect and isolate any existing electrical service equipment in accordance with the utility company’s requirements. Use established industry and utility safety practices while removing electrical service equipment near any overhead utilities.
Remove existing electrical service support a minimum of 2 ft. below finish grade unless otherwise shown on the plans. Repair the remaining hole by backfilling with material equal in composition and density to the surrounding area. Replace any surfacing such as asphalt pavement or concrete riprap with like material to equivalent condition. Disconnect conductors and remove them from the conduit or duct. Cut off all protruding conduit or duct 6 in. below finish grade. Abandoned
conduit or duct need not be removed unless shown on the plans. Reconnect duct cable, conductors, and conduit to be reused when shown on the plans. Make all splices in ground boxes unless otherwise shown on the plans. Accept ownership of unsalvageable materials, and dispose of them in accordance with federal, state, and local regulations.

A. Installation. This price is full compensation for paying all fees, permits, and other costs; making arrangements with the utility company for all work and materials provided by the utility company; furnishing, installing, and connecting all components including poles, service
supports, foundations, anchor bolts, riprap, enclosures, switches, breakers, conduit (from the service equipment including the elbow below ground), fittings, conductors (from the service equipment including the elbow below ground), brackets, bolts, hangers, and hardware; and equipment, labor, tools, and incidentals.

Costs for utility-owned power line extensions, connection charges, meter charges, and other charges will be paid for by the customer, The customer will reimburse the contractor only the amount billed by the utility. No additional amount for supervision of the utility’s work will be paid.
Removal. This price is full compensation for coordinating with the utility company to disconnect and isolate the electrical service; removing the service supports; backfilling holes; and equipment, labor, tools, and incidentals.