Sub Panel Wire Size (Ontario)


Old 06-16-15, 02:18 PM
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Sub Panel Wire Size (Ontario)

Good morning/afternoon/evening

I'm getting ready to install a sub panel in another area of my home. Total cable length about 85' (little less).

The cable will be buried. The cable I'm going to use will be armor sheathed and direct burial rated.

The sub panel will be fed from my 100AMP service main distribution panel to the sub panel being 100 AMP (most of my house will be on this panel).

I was going to use 3 3 3 copper for this. Its 20$ a meter. The electrical supply store recommended an alternative of 2 2 2 aluminum as it is 7$ a meter.

Finally my question.
What aluminum wire size do I need in order to feed a 100 AMP sub panel? (In Ontario, Canada)

Thank you for your advice.
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Old 06-16-15, 06:56 PM
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The NEC in the U.S. requires a 4-wire feeder and I think the CEC would require the same. You could probably safely get away with #2 aluminum on a 90 amp subfeed breaker.
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