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Old 04-12-2013, 09:28 AM   #1
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


I want to run a 240V 40A circuit (red/black/white/bare) from my main box to my attached garage. I would also like a 120V 20A circuit out there as well. It seems like I can install a sub-panel with a 20A breaker in the garage and supply it from one leg of the 240V. Being in a garage I will need GFCI protection. If the main box uses a 240V 40A GFCI circuit breaker, will the 120V circuit "confuse" the GFCI? That is, the 120V will be returning current on the white/neutral wire, while the 240V will be returning current, alternately on the hot (red/black) wires. The GFCI has connections for all three, so I could imagine it can metering the total out-current and comparing it to the total in-current. Can it?

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Old 04-12-2013, 09:33 AM   #2
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


It would work, but I would not go through that expense.
Use a standard breaker and use gfci receptacles where they are needed.

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Old 04-12-2013, 09:45 AM   #3
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


I am all for avoiding unnecessary expense and a GFCI circuit breaker is indeed expensive! However, while 120V GFCIs outlets are cheap and available, I haven't had much luck finding GFCI's for 240V. That strikes me as odd, since I would expect the need to be pretty common. Are they out there?
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Old 04-12-2013, 10:28 AM   #4
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


Only 120v recepts need GFI protection.
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Old 04-12-2013, 11:42 PM   #5
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


I know the state side the garage you can use the GFCI on 120 volt 15 or 20 amp circuit but for 240 volt useage almost never used unless specfic equiement call for that. so run the 240 volt circuit in convental manner.

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Marc
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Old 04-13-2013, 09:30 AM   #6
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


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Originally Posted by k_buz View Post
Only 120v recepts need GFI protection.
Spas,pools and hot tubs??? 240 volts.
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Old 04-13-2013, 09:37 AM   #7
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


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Spas,pools and hot tubs??? 240 volts.
That would be required in a different section of the NEC and would not fall under the garage wiring code.
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Old 04-13-2013, 09:38 AM   #8
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


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Spas,pools and hot tubs??? 240 volts.
Are we talking about Spas, pools and hot tubs?
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Old 04-13-2013, 09:42 AM   #9
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


Only 120 volt receptacles are required to be gfi'ed.
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Old 04-13-2013, 12:02 PM   #10
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Can GFCI circuit breaker handle combined 240V and 120V circuits?


I agree with the others, just run a normal 120/240 feeder to the garage sub-panel and use 120 volt GFI receptacles.

120/240 GFI breakers up to 50 amps are available, but they're expensive.

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