Which do you trust more? (Grounding vs. GFCI) - Page 6 - Electrician Talk - Professional Electrical Contractors Forum
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Old 02-21-2015, 06:53 PM   #101
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GFIs dont work without a ground
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Old 02-21-2015, 06:56 PM   #102
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GFIs work the same as an amprobe, if it doesnt see a diff you read 0
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Old 02-21-2015, 06:59 PM   #103
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if theres no ground theres no imbalance between hot and neut. just a live piece of equipment
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Old 02-21-2015, 07:33 PM   #104
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I thought we were talking about a system with no ground, not a gfi without a ground
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Old 02-21-2015, 09:40 PM   #105
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Originally Posted by ELECTRICK2 View Post
I thought we were talking about a system with no ground, not a gfi without a ground

There's always a ground. Somewhere, there's a ground path.
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Old 02-21-2015, 09:52 PM   #106
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All smartassedry aside, yes, a GFI needs a ground path in order to work. There has to be a difference between hot and neutral, which means something has to go to ground somewhere in order for it to work properly.
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Old 02-21-2015, 10:53 PM   #107
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Thanks mikey383
You said what I was try I by to say
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Old 02-22-2015, 02:18 AM   #108
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I dont think a gfi will trip if it doesny have a ground reference
If you mean current going onto another pathway that might be ground (isn't always) then yes.
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Old 02-22-2015, 02:19 AM   #109
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All smartassedry aside, yes, a GFI needs a ground path in order to work. There has to be a difference between hot and neutral, which means something has to go to ground somewhere in order for it to work properly.
Nope. That other path could be another hot, neutral... it isn't always ground. Think wiring errors.
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Old 02-22-2015, 06:17 AM   #110
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Nope. That other path could be another hot, neutral... it isn't always ground. Think wiring errors.
Technically you are correct, but I'd be willing to bet some money that 99%+ of GFCI tripping events are due to current flowing to ground somewhere where it's not supposed to. (We are talking about the 15A & 20A circuits and not GFP on services or equipment, right?)
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Old 02-22-2015, 07:04 AM   #111
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Originally Posted by hardworkingstiff View Post
Technically you are correct, but I'd be willing to bet some money that 99%+ of GFCI tripping events are due to current flowing to ground somewhere where it's not supposed to. (We are talking about the 15A & 20A circuits and not GFP on services or equipment, right?)

Correct, but just pointing out that its technically possible, such as a GFCI doing a feed through to down stream devices.
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Old 02-22-2015, 08:46 PM   #112
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I know .. i know....I'm just trying to explain that grounding and bonding are two different things. and doing a poor job at it...

But do you get what I'm saying about life safety..?
Paging riveter. Paging riveter!
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Old 02-22-2015, 08:49 PM   #113
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I trust Mtw. He's a well trained Union electrician.
I have never been in the union in my life.
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Old 02-22-2015, 08:53 PM   #114
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Originally Posted by captkirk View Post
We ground to the earth like a main service and transformer to facilitate the opening of a breaker in the event of a short.


The connection to the earth does not do that. The bonding back to the source is what serves that function.
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