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Old 04-29-2008, 10:14 PM   #1
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Default Using 2 single pole GFCI Breakers

I am installing a pool. Can I use 2 single pole GFCI 20 amp breakers to feed the 220 volt pump instead of a double pole GFCI? If so how does it wire with respect to the neutrals?
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Old 04-29-2008, 10:41 PM   #2
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Originally Posted by Trane Tech View Post
I am installing a pool. Can I use 2 single pole GFCI 20 amp breakers to feed the 220 volt pump instead of a double pole GFCI? If so how does it wire with respect to the neutrals?
All multi-wire branch circuits must be simultaneousy disconnected as per NEC 2008 210.4

I would ask your local inspector. But I would put it on a 2 pole GFCI. I realize these are more expensive, but don't cut corners.
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Old 04-29-2008, 11:46 PM   #3
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Originally Posted by BackInTheHabit View Post
All multi-wire branch circuits must be simultaneousy disconnected as per NEC 2008 210.4

I would ask your local inspector. But I would put it on a 2 pole GFCI. I realize these are more expensive, but don't cut corners.
I would first question if this install is a MWBC?

Second, two single pole breakers can meet the requirements of 210.4 with a handle tie installed.

If this install is a MWBC then two single pole GFCI breakers will not work. One circuit may at times draw more current then the other circuit and this will cause a current in-balance which can trip the breaker.

Last edited by Roger123; 04-30-2008 at 12:40 AM. Reason: Re-read pool install
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Old 04-29-2008, 11:54 PM   #4
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Default Mwbc?

What is MWBC? I have a neutral pulled to power a timer. I have already bought 2 single pole GFCI breakers. I guess I did not have to but I did! Can I m ake this work or do I need to get a double pole GFCI? "
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Old 04-30-2008, 12:28 AM   #5
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What is MWBC? I have a neutral pulled to power a timer. I have already bought 2 single pole GFCI breakers. I guess I did not have to but I did! Can I m ake this work or do I need to get a double pole GFCI? "
MWBC is a multi wire branch circuit. Two separate circuits sharing one common neutral.

Now after re-reading this install is for a pool you may be required to have GFCI protection for this circuit. If so, the best install would be a double GFCI breaker as Back-in wrote.

Last edited by Roger123; 04-30-2008 at 12:38 AM.
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Old 04-30-2008, 05:50 AM   #6
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I guess this is a residential pool with the pump outside. Is a gfci required for this type of hardwired install? As for the neutral for the timer, I would have used a 240v timer and forgot about the neutral.
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Old 04-30-2008, 07:10 AM   #7
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