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I just wired a 240 heater using 2 existing 120v circuits. One of the circuits has a GFCI outlet, the other has a normal outlet. The heater is wired downstream of both outlets using the hot wire from each. I measure 240 at the heater. When the heater comes on, it pops the GFCI. Can someone explain to me why this is happening?
 

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InstruMike said:
I just wired a 240 heater using 2 existing 120v circuits. One of the circuits has a GFCI outlet, the other has a normal outlet. The heater is wired downstream of both outlets using the hot wire from each. I measure 240 at the heater. When the heater comes on, it pops the GFCI. Can someone explain to me why this is happening?
You don't wire a 240 heater from 2 separate circuits.
 

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The GFCI is working as intended ... behave yourself.
Yeah, when OP says "downstream of the GFCI" I am thinking it is on the load side of the GFCI receptacle. It detects the current flowing to the other leg instead of the neutral as intended, and trips.

Might have to do it right and get a double pole breaker. Or just hack it from the line side of the GFCI.
 

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