Reply by Ocelot

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Posted on 220 cord sizing

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2375 posts in 3242 days

#1 posted 07-11-2014 07:59 PM

Your HVAC system probably includes strip heating for extremely cold days when the heat pump isn’t enough by itself. Unless you are running your equipment under those conditions, it should do no harm to take your power from the load side of the HVAC breaker. Usually, there is a seperate breaker for the strip heater. Don’t take the power from the supply side of that breaker, since that breaker is already sized to protect the wiring to that point.

... However… It is much better to do it right – go all the way to the main or sub-panel with appropriately sized wire and connect to an appropriate breaker there.


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