Updated_-_26_05_33_-_Electrical_Conduit_Revised_2025_01_10_0003.pdf

GVIC Fish Screen Rehabilitation Upper Colorado River Endangered Fish Recovery Program Solicitation No. 140R4024R0024

Electrical Conduit

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SECTION 26 05 33

ELECTRICAL CONDUIT

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Furnishing and Laying Underground Conduit

1. Measurement: Length of encased or underground conduit pipe runs as listed on

Drawing No. 1745-417-135.

2. Payment: Linear foot offered in the Price Schedule for Furnishing and Laying

Underground Electrical Conduit. The unit price shall include all labor, equipment, and materials for:

a. Furnishing and installing all underground conduit as listed on Drawing

No. 1745-417-135.

3. Cost: The cost of all electrical conduit that is above ground will be included in the

Price Schedule under Complete Electrical System in Section 26 05 02.

1.02 REFERENCE STANDARDS

A. American National Standards Institute (ANSI)

1. ANSI C80.1-2015 Electric Rigid Steel Conduit (ERSC)

B. ASTM International (ASTM)

1. ASTM F512-12 (2017) Smooth-Wall Poly (Vinyl Chloride) (PVC)

Conduits and Fittings for Underground Installation

C. Institute of Electrical and Electronics Engineers (IEEE)

1. IEEE C2-2017 National Electrical Safety Code (NESC)

D. National Fire Protection Association, Inc (NFPA)

1. NFPA 70-2017 National Electrical Code (NEC)

2. TC2-2013 Electrical Polyvinyl Chloride (PVC) Conduit

E. Underwriters Laboratories (UL)

1. UL 360(2013) Liquid-tight Flexible Steel Conduit

2. UL 651(2011) Schedule 40 and 80 Rigid PVC Conduit

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PART 2 PRODUCTS

2.01 CONDUIT

A. UL listed.

B. Rated for intended purposes or labeled by nationally recognized testing laboratory (NRTL) accredited by Federal Occupational Safety and Health Administration (OSHA) when applicable.

C. Flexible Metal Conduit for Outdoor Use:

1. Liquid tight type.

2. Ultra-violet resistant.

D. Nonmetallic PVC conduit: NEMA TC 2, EPC-80, ASTM F512

1. Sunlight resistant

2. Temperature rating not less than 90 degrees C.

2.02 CONDUIT ACCESSORIES

A. Fittings required to complete electrical conduit systems. Includes, caps, connectors, couplings (excluding expansion and expansion-deflection couplings), nipples, reducers, elbows, pipe plugs, locknuts, bondnuts, bushings, seals (excluding wall penetration seals), and any other fittings.

B. Devices required to complete electrical conduit systems and to fasten, clamp, attach, and support each conduit in place.

1. Includes threaded joint compound; protective sealant; materials for sealing ends of conduits terminating at outdoor boxes, panelboards, or cabinets; supports and clamps.

2. Complete with bolts, washers, and nuts.

C. Conduit Sealing Bushings:

1. Non-Toxic.

2. Non-shrinking.

3. Fire-retardant type.

4. Seals against liquid, gas, and vapor seepage.

5. Protective Sealant:

6. Water repellant.

7. Resistant to peeling and cracking.

D. Exposed Outlet Bodies and Boxes: Suitable for outdoor installation.

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E. Junction Box, Junction Box Extensions, and Junction Box Covers: Suitable for outdoor installation.

F. Expansion Couplings:

1. Furnish for longitudinal movement only.

2. Watertight type.

3. Expansion couplings for plastic conduit shall expand at least 4 inches for each

100 feet of run and for each 100 degrees F temperature change.

G. Fabricated Sheet Steel Boxes:

1. Large junction and conduit boxes, excluding outlet boxes, to contain wiring devices or to accommodate lighting fixtures.

2. Sheet steel thickness: No. 14 United States Standard gauge, minimum.

3. Sheet steel finish: Suitable for outdoor installation.

4. Attach covers with bronze, brass, or stainless-steel screws or bolts.

5. Boxes exposed to weather:

a. Weather-resistant and watertight type.

b. Provide covers with gaskets.

H. Wireways:

1. Fabricate of gauge steel in conformance with applicable codes.

2. 304 Stainless Steel.

3. Suitable for outdoor installation.

4. Covers: Hinged or screw type as indicated on drawings.

5. Secure screw-type covers with rustproof screws.

6. Furnish wireways without knockouts unless otherwise indicated on drawings.

7. Drill and punch onsite as required.

I. Sealing Materials:

1. General use:

a. Non-toxic.

b. Non-shrinking.

c. Fire retardant type.

d. Seal ends of conduit against liquid, gas, and vapor seepage.

2. Hazardous locations:

a. Melting point of not less than 200 degrees F.

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b. Meet UL standards for hazardous locations.

c. Prevent passage of gas or vapor.

J. Adhesive: In accordance with conduit manufacturer's recommendations.

K. Polyethylene warning tape.

1. Width: 6 inches.

2. Color: Red

3. Copy: Continuously imprinted with “CAUTION BURIED ELECTRIC LINE

BELOW”.

4. Suitable for direct burial.

PART 3 EXECUTION

3.01 INSTALLATION

A. Exposed conduit runs:

1. Straight and parallel with each other and with centerlines of structure.

2. Support conduit rigidly from structure within 3 feet of each outlet box, junction box, cabinet, or fitting; and at intervals of not more than 5 feet.

3. Installation includes, where required, drilling holes in bottom, side, or top of enclosures or plates of other electrical equipment.

4. Tighten conduit securely.

5. Support conduit rigidly in place.

6. Make connections to outdoor boxes watertight.

B. Buried conduit:

1. Buried conduit runs must be PVC, see paragraph 2.01 D.

2. Install polyethylene warning tape 18 inches above conduits.

C. Equipment connections:

1. Connections to equipment must be flexible metal conduit.

D. Conform with NFPA 70 and IEEE C2.

E. Determine routing of exposed conduit when not indicated on drawings.

F. Determine exact locations of embedded conduit stub-ups based on equipment being furnished.

G. Install conduit with necessary fittings and supports.

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H. Ensure that conduit runs and bends are free from kinks, indentations, or flattened surfaces.

I. Bends:

1. Install smooth, gradual bends to permit pulling insulated conductors without undue stress or damage to conductors or conduit.

2. Make metal conduit bends onsite with less than minimum radii required by NFPA

70.

J. Remove burrs and sharp corners at ends of metal conduit.

K. Coat male threads of rigid metal conduit joints with suitable graphite or zinc sealing material before making joints.

L. Tighten conduit joints securely to ensure electrical continuity and to prevent entrance of moisture or foreign material.

M. Install bushings or Chase-type nipples on ends of conduit to protect insulation of insulated conductors from abrasion.

N. Install locknuts and bondnuts to provide tight ground connections between conduit and boxes, panelboards, and cabinets.

O. Stub conduit that terminates at horizontal surfaces 2 inches above finished floor level and terminate with coupling and plug. Replace plug with bushing or chase-type nipple before installing insulated conductors.

P. Tighten conduit to electrical equipment mounted on tubular metal structures securely and support rigidly in place by conduit clamps, hex head nuts, and threaded 3/8-inch stud fasteners driven by powder-actuated tools.

Q. Conduit embedded in concrete:

1. Hold conduit, conduit fittings, and conduit boxes securely in position while concrete is being placed.

2. Protect ends of conduit to prevent entrance of concrete, sand, or other foreign material.

3. Terminate ends of conduit that do not terminate at boxes with couplings and pipe plugs or insulating bushings and caps.

4. Clean concrete from inside of conduit boxes immediately after forms are removed.

5. Clean threads for attaching devices and covers to boxes.

6. Swab conduit within 24-hours after removal of forms with clean dry rags until conduit is thoroughly cleaned and dried.

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7. Grease threads of removed plugs and reinstall plugs to prevent entrance of water or foreign material.

8. Seal conduit boxes with rubber gasketed blank cover.

END OF SECTION