50 amp 2 pole GFCI Breaker feed to Sub-panel

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  #1  
Old 02-23-07, 02:28 PM
dwf
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Arrow 50 amp 2 pole GFCI Breaker feed to Sub-panel

If a 50 amp 2pole GFCI is installed at the main to feed the sub panel is the sub-panel competely protected. For instance if you install a 20 amp single pole in the sub will it be GFCI protected.
 
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Old 02-23-07, 02:53 PM
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Of course.
 
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Old 02-23-07, 02:58 PM
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Those breakers are probably a pretty penny as well?!
 
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Old 02-23-07, 03:16 PM
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The only thing anybody ever uses them for is a hot tub.
 
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Old 02-23-07, 04:18 PM
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If you are feeding a pool panel with at least one 240v cord connected motor then they can be a money saver.

Cord connected pump, pool light, pool area receptacles, etc, all require GFI protection. You can kill several birds with one stone with a GFI protected feeder.
 
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Old 02-23-07, 09:38 PM
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GFCIs , Don't leave home without em'!
 
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Old 02-23-07, 09:49 PM
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Speedy -

Why can you buy a 50 a spa panel for $60 with a breaker included, but a 20 amp double GFI cost $100 ?

Thanks - ( sorry if I hijacked)
 
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Old 02-24-07, 05:16 AM
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If you can buy a spa disconnect for $60 send me ten!
 
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Old 02-26-07, 10:07 AM
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I've never seen them for $60. The cheapest Homeline GFCI disconnects are about $75. As far as the difference in breaker prices, it has to be the result of manufacturing scale. They probably sell 10 times the number of 50A GFCI double pole breakers as they do 20A or 30A.
 
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Old 02-26-07, 10:35 AM
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Yep, good old supply and demand, as we learned in Economics 101.
 
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Old 03-01-07, 08:52 AM
dwf
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Thanks to everyone. Yes, I am feeding a pool sub-panel and want everything protected. Cost of a pool and spa panel including 50 amp GFCI @ HD $80. I will removed the GFCI and installed it at the main to feed the sub. I will then use the appropriate standard breakers in the sub to feed the equipment. This saves me some $.
 
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Old 03-01-07, 09:17 AM
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A couple of issues to keep in mind with what you plan on doing:

1) Make sure that the breaker that you 'extract' from the spa disconnect is one that is appropriate for the panel that you are putting it into. This means either that the breaker is one listed on the panel label, or the breaker is one that is 'classified' for your panel. Just because the breaker seems to fit does not mean that it is actually suitable for your panel.

2) Using a GFCI feeder as you describe means that the _total_ leakage to ground from _all_ of the equipment fed by the subpanel must be less than the trip setting of the 50A GFCI. There is almost always some small amount of leakage to ground on equipment, and sometimes this is an intentional part of the equipment design. For example a surge protector that has MOVs connected between the circuit conductors and ground will have a tiny bit of leakage through the MOVs.

Depending upon the equipment that you supply and how much you are supplying, you might have problems with 'nusiance tripping', caused by the aggregate total of minor current leaks to 'ground'. The only way to know if this will be a problem is to actually try it.

-Jon
 
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