Which type of the wire or cable for cold weather?

MrElectrician · 发表于 2010-4-19 15:02

Does anyone know that T90 wire can be used outside in Fort McMurray area or Oil Sands plants, with extremely low temperature in winter time? With or without counduit?

Whether the answer is yes or not, please specify where you find the regulations or standards.

Thanks

homestay · 发表于 2010-4-19 17:59

本帖最后由 homestay 于 2010-4-19 19:05 编辑

Canadian Electrical Code specified the highest temperature rating for most calbes/conductor insulations but did not mention the lowest temperature rating. In this case, the best way to indentify the cable capability is to check the manufacture's specifications, since all cables are registered and appoved by CSA.

Although T90 is most commonly used in all residential, commercial and industrial settings, but it is only rated for -25 as per to manufacture's description, so it does not fit the temperature requirment in Fort Mac. I was once working on an outside plug of a washcart which was wired by T90 when it was minus 35, when I tried to pull the wire out from JB, the insulation cracked and dropped off like mud instantly. in this case , RW90 would be a better choice.

Some most commonly used wires for your refference:

Unarmoured

% A& T: x2 b+ l8 f _T90 Nylon/TWN75 600 Volts 90ºC Cu

General purpose building wire for installation as exposed or concealed wiring and in raceways (except cable trays) in dry or damp locations.
Minimum recommended installation temperature minus 10°C (with suitable handling procedures).
Maximum conductor temperature 90°C dry, 75°C in wet locations, and 60°C when exposed to oil.
Approved for use with ceiling fixtures.

* D7 B$ K) P7 HTW (–40°C) PVC 600 Volts 60ºC Cu:

For exposed wiring, and in raceways (except cable trays and ventilated flexible cableways) in dry or wet locations.
For exposed wiring exposed to the weather.
Minimum recommended installation temperature minus 40°C (with suitable handling procedures).
Maximum conductor temperature 60°C.
7 Z6 z/ b9 ]/ S# k- r
RW90 (–40°C) XLPE Insulated Wire 90°C

For open wiring and raceways (except cabletroughs and ventilated flexible cableway) in dry or wet locations.
For exposed wiring where exposed to weather with sunlight resistant insulation. Standard Black #6 and larger is sunlight resistant and marked "SR"; coloured insulation is NOT.
Minimum recommended installation temperature minus 40°C (with suitable handling procedures).
Maximum conductor temperature 90°C.
Approved for use with ceiling fixtures.

NMD90 XLPE CANADEX* 300 Volts 90ºC (Loomix)

For open or concealed wiring in dry or damp locations where not exposed to mechanical injury.

Minimum recommended handling temperature minus 25°C for 2 conductor cables and minus 10°C for 3 conductor cables (with suitable handling procedures).
Maximum conductor temperature 90°C.
Approved for use with ceiling fixtures.

MrElectrician · 发表于 2010-4-20 10:41

2# homestay

Thank you for the detail information, HOMESTAY, a great answer!

I heard that some equipment previously using T90 wire from original manufucturer was removed by QC/QA after it was set up in the Oil Sands companies, but some still used inside the conduit.

As you know, RW90 XLPE are widely used here, but I do not know if there is any company standard to specify it can not be used in cold weather in Oil Sands.

MrElectrician · 发表于 2010-4-20 10:44

Correction:

RW90 is widely used outside here, but not T90 wire or T90 wire in conduit for outside usage, I want to know if there is any company standard to specify it can not be used in cold weather in Oil Sands.

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[技术互助] Which type of the wire or cable for cold weather?