Project Number: 228730
Issue Date: August 2017
3.
WWTE SCADA Upgrades
Nashua, NH
Provide factory applied nylon or polyvinyl chloride (PVC) external jackets
on wires and cables for pulls in raceways over 100 feet in length, for pulls
in raceways with more than three equivalent 90 degree bends, for pulls in
conduits underground or under slabs on grade, and where indicated.
B. Service & Distribution Wiring
1.
2.
3.
4.
98 percent conductivity copper
600 volt insulation, type XHHW
ULL. listed for underground use in wet locations at 75° C.
Use XHHW for #4 and larger and THHN/THWN or XHHW for #6 and
smaller.
C. Branch-Circuit Wiring
1.
2.
5.
6.
D. Splices
1.
98 percent conductivity copper
600 volt insulation, type, THWN/THHN, or XHHW
Stranded conductor: #14 AWG and larger
Minimum branch circuit: #12 AWG
Minimum #10 AWG for 120 volt circuits more than 100 feet long.
Minimum #10 AWG for 277 volt circuits more than 230 feet long.
No. 10 and smaller with 600-volt pressure type insulated connector of
wire-nut type, or equal; soldered and crimped type not allowed. Ideal type
“wire nut” Buchanan type “B-Cap” and Minnesota Mining (3M) type
“Scotchlok”.
No. 8 and larger with solderless lugs or solderless connectors of Lock-tite
or similar type properly taped with plastic insulating tape, Minnesota
Mining Co. #33, or equal, then two half-lap servings of friction tape,
Manson, or equal.’
Wire connector systems for use with underground conductors shall be UL
listed specifically for such use.
Service entrance conductors shall be installed without splices. Electrical
equipment feeders shall be spliced only where shown or specifically
LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
WOODARD & CURRAN 26 05 19-3
