6. Scope of Work and Detailed Specifications
6.6. Technical Requirements / Scope of Work
6.6.3. Cable: Single-Conductor, Copper 600 Volt
This specification states the requirements for single conductor cables intended to be used in 240 VAC street lighting circuits. The cable will also be used as service cable for both street light controllers and traffic signal controllers. The cables will be installed in underground conduit and rated as 600 volt.
6.6.3.2.
Specifications Referenced
The cable must conform in detail to the requirements herein stated, and to the applicable portions of the latest revisions of the specifications and methods of test of the following agencies:
1. ASTM – American Society for Testing and Materials 2. ICEA – Insulated Cable Engineers Association
3. IEEE – Institute of Electrical and Electronics Engineers 4. UL – Underwriters Laboratories
Cable not in accordance with this specification will not be accepted.
6.6.3.3.
Cables
The cable must consist of an uncoated multiple strand copper conductor with a tight fitting thermoset, free stripping, concentric layer of ethylene propylene (EPR) insulation.
The number of strands and the outer diameter of the cable shall be as noted in TABLE A. Cable shall be UL approved for sunlight resistance and for direct burial applications. Cable must meet IEEE 383 and UL 1581 70,000 BTUs per hour flame test requirements.
6.6.3.4.
Color Code
Triplexed cable shall consist of a black cable, a red cable, and a green ground cable. Triplexed cable will have a 16” to 18” lay.
Individual cables will be black, red, or white, depending upon the order.
6.6.3.5.
Conductor
The conductors must be soft round copper strands.
The conductor must meet the requirements of ASTM B3 and ASTM B8.
The conductor sizes must be in accordance with all requirements in Table A of this specification.
The number of strands must be as indicted in Table A. Stranding must meet the requirements of ASTM B8, Class B.
6.6.3.6.
Insulation
The insulation must be ethylene propylene rubber compound (EPR) meeting the requirements of ICEA S-95-658 and UL 44 for RHW-2 cable and UL 854 for USE-2 cable.
The insulation must be circular in cross-section, concentric to the conductor, and must have an average thickness not less than that set forth in Table A of this specification, and a spot thickness not less than ninety percent (90%) of the average thickness.
The cable must be identified by a permanently inscribed legend in white lettering as follows: 1/C No. (conductor size) AWG-600V-90oC-EPR-RHW-2
The legend must be repeated at approximately eighteen (18) inch intervals on the outside surface of the cable parallel to the longitudinal axis of the conductor. A sequential footage marking must be located on the opposite side from the legend.
6.6.3.7.
Testing
Initial Physical Requirements.
1. Tensile strength, minimum, p.s.i. 1200
2. Elongation at rupture, minimum % 250
Oven Exposure Test. After conditioning in an air oven at 121±1ºC for 168 hours using methods of test described in ASTM D 573:
1. Tensile strength, minimum % of initial value 75
2. Elongation at rupture, minimum percent of initial value 75
Water Absorption Test. Gravimetric method: After 168 hours in water at 70±1ºC water absorption, at a maximum – 5 milligrams per square inch
Cold Bend Test. The completed cable must pass the test requirements of ASTM D 470, except that the test temperature must be -25ºC.
1. Voltage. The completed cable must meet an A.C. and D.C. voltage test in accordance with ASTM D 470 and D 2655. 2. Insulation Resistance. The completed cable must have an insulation resistance constant of not less than 20,000 ohms when tested in accordance with ASTM D 470.
Flame Tests. Cable must pass a 70,000 BTU flame test in accordance with IEEE 383.
All of the above tests must be on cable produced for the order. Tests must be taken on samples taken every 25,000 feet, or fraction thereof, of each conductor size.
Test Reports. No cable shall be shipped until certified copies of all factory tests have been reviewed and approved by the City. Cable that does not pass any one of the above tests will be rejected.
6.6.3.8.
Packaging
Reels. The completed cable must be delivered on sound substantial, non-returnable reels. Both ends of each length of cable must be properly sealed against the entrance of moisture and other foreign matter by the use of clamp-on cable caps. The ends must be securely fastened so as not to become loose in transit. Before shipment, complete 2 X 4 lagging must be applied to all reels.
Footage. Each reel must contain the length of cable as set forth in Table A of this specification. Alternate lengths may be considered.
Reel Marking. A metal tag must be securely attached to each reel indicating the reel number, contract number, date of shipment, gross and tare weights, the appropriate City commodity code if applicable, and a description of the cable. Also, each reel must have permanent marking on it indicating the total footage, and the beginning and ending sequential footage numbers. Directions for unrolling the cable must be placed on the reel with an approved permanent marking material such as oil-based paint or a securely attached metal tag.
TABLE A
CONDUCTOR
AWG STRANDS THICKNESS MILSINSULATION A-C TEST VOLTS REEL LENGTHFEET DIAMETER INCHOVERALL
14 7 45 5500 2000 .133 12 7 45 5500 2000 .152 10 7 45 5500 2000 .176 8 7 60 5500 2000 .236 6 7 60 5500 2000 .274 4 7 60 5500 2000 .322 2 7 60 5500 1000 .382 1/0 19 80 7000 1000 .470 2/0 19 80 7000 1000 .514 3/0 19 80 7000 1000 .564
4/0 19 80 7000 1000 .620
250 MCM 37 95 8000 1000 .705