Question about Electric Circuit Breaker Kit for Furnace
#8 copper only do not even think about aluminum, because of the chance of aluminum causing a fire.
Posted on Oct 07, 2019
Assuming this is residential and your voltage is 240. #8 copper or #6 aluminum on a 40amp 2-pole breaker , I'd suggest the copper. Aluminum is cheaper but you get what you pay for. If you decide on the aluminum make sure you use a de-oxidizer such as "nolox" or your connections will burn up which could be a fire hazard.
Posted on Dec 17, 2011
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