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Old 06-16-2009, 09:21 PM   #16
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outdoor outlet doesn't work; not fuse


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Originally Posted by Atroxx View Post
You may have actually received a shock and not even have felt it, GFCI's can trip that quick.
I'm not so sure; for more current it trips faster so it seems you get more or less the same dose each time.

Trip times for GFIs: T in seconds = (20/I)^1.43, with I in mA. This is a design goal, they actually trip quicker.
So, I = 20/(T^0.7).
For T = 300 seconds, I = 0.4 mA.
For 20 mA, the let-go threshold, you could get one whole second.


Last edited by Yoyizit; 06-16-2009 at 09:26 PM.
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Old 06-16-2009, 09:30 PM   #17
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outdoor outlet doesn't work; not fuse


That's good to know, I am unfamiliar with the inner workings of a GFCI, all I really know is how they trip and that they're supposed to go off PDQ. So was I right at all, or would it be impossible to get hit on a GFCI circuit and not feel anything?
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Old 06-16-2009, 09:37 PM   #18
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outdoor outlet doesn't work; not fuse


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Originally Posted by Atroxx View Post
That's good to know, I am unfamiliar with the inner workings of a GFCI, all I really know is how they trip and that they're supposed to go off PDQ. So was I right at all, or would it be impossible to get hit on a GFCI circuit and not feel anything?
Depends on how many cocktails you have!
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Old 06-16-2009, 09:41 PM   #19
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outdoor outlet doesn't work; not fuse


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Originally Posted by Atroxx View Post
That's good to know, I am unfamiliar with the inner workings of a GFCI 1,
So was I right at all, or would it be impossible to get hit on a GFCI circuit and not feel anything? 2
1
http://www.national.com/ds/LM/LM1851.pdf

2 Dunno'.
Back in the 70s they gave shocks to 150 pound dogs, probably looking for fibrillation or other bad things, so they could set a trip limit.
Maybe it's a selling point; every time you get a shock that you feel, the GFCI is reminding you that it saved your life for a mere $10 or so.
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Old 06-17-2009, 04:00 PM   #20
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outdoor outlet doesn't work; not fuse


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Turns out the circuit breaker is not tripped but the GFCI that the whole circuit runs off of did trip.
Check the boxes downstream of the good receptacle for moisture. I had a leaky box that was tripping a GFI regularly, but the moisture wasn't obvious due to the receptacle and a mess of wires blocking the view.
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Old 08-01-2013, 10:26 PM   #21
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outdoor outlet doesn't work; not fuse


I realize this thread is very old, BUT it helped me out VERY much in the present day. I didn't imagine something outside could be linked to something upstairs in the bathroom. Thanks much!!!

L22

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electrical outlet box, gfci switch/outlet, outdoor wiring


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