Attachment 3 - 260518 LOW-VOLT POWER CONDUCTORS JAN19.pdf

JUBA ELECTRICAL UPGRADE DEVELOPMENT July 13, 2020

JUBA SOUTH SUDAN Issued for Bid

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES SECTION 260518 - 1

SECTION 260518 - LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes building wires and cables and associated connectors, splices, and terminations for wiring systems rated 600 V and less.

B. Related Sections include the following:

1. Division 07 Section on “Penetration Firestopping.”

2. Section 260505 “Common Work Results for Electrical, Communications, and Electronic

Safety.”

3. Division Section 26 on “Identification for Electrical Systems.”

4. Division 27 Sections for communications cables.

5. Section 337105 "Underground Ducts and Raceways."

1.2 SUBMITTALS

A. Product Data - General: For each type of product indicated.

B. Product Data - Products Manufactured to International Standards: Identify variations from U.S.

standards.

C. Qualification Data: For testing agency.

D. Field quality-control test reports.

1.3 QUALITY ASSURANCE

A. Testing Agency Qualifications: Testing agency as defined by OSHA in 29 CFR 1910.7 or a member company of the InterNational Electrical Testing Association (NETA), or is nationally recognized testing laboratory (NRTL) as defined by OSHA in 29 CFR 1910.7, and that is acceptable to Contracting Officer/COR based upon input from OBO/PDCS/DE/EE.

1. Testing Agency's Field Supervisor: Person currently certified by the InterNational

Electrical Testing Association or the National Institute for Certification in Engineering

Technologies to supervise on-site testing specified in Article on FIELD QUALITY

CONTROL.

B. Comply with the OBO Electrical Code (NFPA 70 “National Electrical Code” as amended by

OBO).

1. Electrical Components, Devices, and Accessories: Listed and labeled as defined in the

NFPA 70, Article 100 by a testing agency acceptable to Contracting Officer/COR based upon input from OBO/PDCS/DE/EE, and marked for intended use.

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES SECTION 260518 - 2

C. Products Manufactured to International Standards: Variations from U.S. standards require evaluation and approval by Contracting Officer/COR with input from OBO/PDCS/DE/EE.

PART 2 - PRODUCTS

2.1 CONDUCTORS AND CABLES

A. Conductor Material: Copper only complying with NEMA WC 70; solid conductor for 6.0 mm2 and smaller, stranded for 10.0 mm2 and larger. Copper shall be 98 percent conductivity and hard drawn.

B. Conductor Insulation Types: Type THHN-THWN, XHHW, SO, or XHHW-2 complying with

NEMA WC 70

1. International Type Conductors and Cables: If requests are approved for international type conductors and cables, conductor and cable ampacities for applications of 600-VAC or less shall not exceed ampacities listed in National Electrical Code Table 310.16.

2.2 CONNECTORS AND SPLICES

A. Description: Factory-fabricated connectors and splices of size, ampacity rating, material, type, and class for application and service indicated.

PART 3 - EXECUTION

3.1 CONDUCTOR AND INSULATION APPLICATIONS

A. Service Entrance: Type XHHW or XHHW-2, single conductors in raceway.

B. Exposed Feeders: Type THHN-THWN, single conductors in raceway.

C. Feeders Concealed in Ceilings, Walls, and Partitions: Type THHN-THWN, single conductors in raceway.

D. Feeders Concealed in Concrete, below Slabs-on-Grade, and in Crawlspaces: Type THHN-

THWN, single conductors in raceway.

E. Exposed Branch Circuits, including in Crawlspaces: Type THHN-THWN, single conductors in raceway.

F. Branch Circuits Concealed in Ceilings, Walls, and Partitions: Type THHN-THWN, single conductors in raceway.

G. Branch Circuits Concealed in Concrete and below Slabs-on-Grade: Type THHN-THWN, single conductors in raceway.

H. Underground Feeders and Branch Circuits: Type THHN-THWN, single conductors in raceway.

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES SECTION 260518 - 3

I. Cord Drops and Portable Appliance Connections: Type SO, hard service cord.

J. Fire Alarm Circuits: Type THHN-THWN, in raceway.

K. Class 1 Control Circuits: Type THHN-THWN, in raceway.

L. Class 2 Control Circuits: Type THHN-THWN, in raceway.

M. Class 3 Control Circuits: Type THHN-THWN, in raceway.

N. Control wiring shall be minimum of 2.5 mm2 (#14 AWG) stranded copper and shall be rated for

600-volt service.

O. Neutral Conductor: Where a secondary distribution system requires a neutral conductor, a full-sized neutral conductor shall be used throughout the system, such that neutral conductor is not shared with any other branch circuit or feeder. If the secondary distribution system supports computers or other equipment that generates harmonics, double size neutrals shall be run from the subpanel boards feeding this equipment back to the MDP or service entrance. Neutral buses shall be sized to accommodate these conductors.

P. Ground Conductor: Insulated equipment grounding conductors run with branch circuits shall be installed such that that conductor is not shared with any other branch circuit.

3.2 INSTALLATION

A. Conceal cables in finished walls, ceilings, and floors, unless otherwise indicated.

B. Use manufacturer-approved pulling compound or lubricant where necessary; compound used must not deteriorate conductor or insulation. Do not exceed manufacturer's recommended maximum pulling tensions and sidewall pressure values.

C. Use pulling means, including fish tape, cable, rope, and basket-weave wire/cable grips, that will not damage cables or raceway.

D. Install exposed cables parallel and perpendicular to surfaces of exposed structural members, and follow surface contours where possible.

E. Support cables according to Section 260505 "Common Work Results for Electrical, Communications and Electronic Safety."

F. Seal around cables penetrating fire-rated elements according to Division 07 Section on

"Penetration Firestopping."

G. Identify and color-code conductors and cables according to Division 26 Section on

“Identification for Electrical Systems.”

H. Install outdoor underground feeders in concrete encased ductbank in accordance with Section

337105 “Underground Ducts and Raceways.”

I. Each electronic equipment rack shall be fed by an individual circuit breaker protected branch circuit.

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES SECTION 260518 - 4

3.3 CONNECTIONS

A. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in

UL 486A and UL 486B.

B. Make splices and taps that are compatible with conductor material and that possess equivalent or better mechanical strength and insulation ratings than unspliced conductors.

C. Wiring at Outlets: Install conductor at each outlet, with at least 300 mm of slack.

3.4 FIELD QUALITY CONTROL

A. Testing: Perform the following field quality-control testing:

1. After installing conductors and cables and before electrical circuitry has been energized, test for compliance with requirements.

2. Perform each electrical test and visual and mechanical inspection stated in

NETA Acceptance Testing Specification (ATS), Section 7.3. Certify compliance with test parameters.

B. Test Reports: Prepare a written report to record the following:

1. Test procedures used.

2. Test results that comply with requirements.

3. Test results that do not comply with requirements and corrective action taken to achieve compliance with requirements.

END OF SECTION 260518