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Wiring electric furnace

16 years ago

I have done a great deal of wiring, but I have never wired a furnace. I say furnace, but I actually have a heat pump with an electric back-up in the air-handler. Note: I am not attempting to wire the internal components, that I left up to HVAC pros. I will simply be running power to the air handler for the controls, blower, and heating element.

The unit has an integral dual-shutoff switch (although it looks like two breakers) labelled as 60 amps and 20 amps. After checking the model number, I noted that my model requires 2 circuits with different overcurrent protection and wire sizes (heating element, blower/controls). The wiring box has a single knockout on the side.

My question is:

What is the optimal way to bring power to the unit? Normally, I see MC cable run to furnaces (but, those have all been heated by gas burners). It seems to me that I would need to run the two circuits in rigid metal conduit or something, but maybe there is an easier way to do this. Any help would be greatly appreciated.


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