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Home Brew Forums > Home Brewing Beer > Electric Brewing > 50amp GFCI Spa panel safe at well below 50amps?
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Old 02-22-2012, 11:36 PM   #1
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Default 50amp GFCI Spa panel safe at well below 50amps?

Planning my electric build and just curious if there i any safety issue using the 50amp GFCI breaker from the spa panel on something i may only be pulling ~25 or 30 amps out of.

I imagine most the time i'll be using 1 element at a time, but would like the expandability in the future but don't want to incur the risk of not tripping the GFCI if something were to happen.


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Old 02-23-2012, 01:33 AM   #2
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There is no problem with that, provided your feeder is rated for at least 50A. The GFCI will trip on ground fault current on the order of milliamps.


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Old 02-23-2012, 01:36 AM   #3
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+1 gfci are designed to save your life and less than 1/2 amp can kill
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Old 02-23-2012, 07:31 PM   #4
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No safety issues at all.

In the USA a GFI meant to protect lives will trip when it senses a mismatch of only 5 mA (0.005 amps) of current between that flowing in vs that flowing out (so to speak).


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Old 02-23-2012, 10:13 PM   #5
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Fantastic! Thanks for all the help.
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Old 01-23-2013, 06:19 AM   #6
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I know this is an old thread but I am getting a 30amp BCS 460 panel from Ebrewsupply, i have 30 amp service to the brew room. So a 50 amp panel will not offer GFCI protection? I am having a hard time finding a 30 amp panel. May be cheaper to put a GFCI breaker in the box?

Thanks for any input
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Old 01-23-2013, 09:42 AM   #7
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The spa panel *will* offer GFCI protection. It will not offer overcurrent protection -- that should be covered by the breaker at the main service panel.
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Old 01-23-2013, 11:58 AM   #8
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Yes, the spa panel will indeed offer overcurrent protection. However, it should never trip if it's being used on a 30-amp circuit, because the 30-amp breaker would trip first.
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Old 01-23-2013, 01:22 PM   #9
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Quote:
Originally Posted by danb35 View Post
Yes, the spa panel will indeed offer overcurrent protection.
Assuming he matched his wiring sizes to the 30a breaker in the main, the spa panel will NOT offer overcurrent protection. The wiring could cook long before the 50a breaker trips. The 30A breaker at the main panel provides the overcurrent protection, the 50a GFCI would only provide GFCI protection.
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Old 01-23-2013, 02:29 PM   #10
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Most spa panels do not offer overcurrent protection anyway...it seems to be a bit of a misnomer to call them 'breakers', the number on the box is only a current rating for the disconnect. The GFCI disconnects in them will work with any load UP TO what they are rated, and still operate as desired. They will still trip with a 2A load if there is a ground fault.


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