Replies

1. 
   DanH | Sep 19, 2004 12:37am | #1

   He's wrong.

2. 
   fireball | Sep 19, 2004 12:40am | #2

   I don't buy it.

3. 
   Mitremike | Sep 19, 2004 01:19am | #3

   Two gfi in a row is the same as one. once the ciruit is protected then everthing down stream is also. In this case more is not better. Mike

4. 
   Gunner | Sep 19, 2004 01:46am | #4

   Get your money back. He's dumb.

   Who Dares Wins.

1. 
   BillHartmann | Sep 19, 2004 02:13am | #5

   "Get your money back. He's dumb."

   That is the craziest thing that I have heard from you.

   That guy worked hard for his money.

   So he does not know everything. Have you every made a mistake?

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   noodlebiter should be paid for the time that he wasted in the seminar.

1. 
   Gunner | Sep 19, 2004 02:23am | #6

   " Have you every made a mistake? "

   Never. :) I feel if your gonna teach safety you should know what your talking about. And something so obvious especialy to a trained safety instructor is just dumb. He doesn't know what he's talking about.Who Dares Wins.

1. 
   BillHartmann | Sep 19, 2004 03:22am | #7

   Gunner, Gunner you need to read a little closer.

   I never said who I was talking about.

   noodlebiter is the one that made the mistake by not walking out and getting a beer or doing something else productive.

1. 
   galvichaser | Sep 19, 2004 06:05pm | #8

   Thanks for the help.

5. 
   FrankB89 | Sep 19, 2004 06:18pm | #9

   Here's a nonscientific but field-proven answer:  My neighbor's wife bought him, for his birthday, a 75' 12 ga. industrial grade extention cord with a GFCI plug (actually, I bought it for her at her request).

   In use,  he plugged it into an outdoor outlet (also GFCI). it was a foggy morning and the combination was tripping constantly until he replugged it into an unprotected circuit.

    

1. 
   DanH | Sep 20, 2004 01:12am | #10

   This is the more likely problem: A GFCI plugged into another GFCI will tend to result in false trips. But this is true only of full GFCI units, not the units they put in hair driers.

   The reason for the false trips is probably that at least some GFCI units put a phantom voltage on the neutral to detect neutral-ground shorts, even with no load. This somehow buggers up the situation.

   Whether it will happen, though, depends on the design and sensitivity of the unit.

6. 
   rjw | Sep 23, 2004 08:01am | #11

   I frequently run into a gfi "downstream" of another gfi.

   When I test them, one or the other will trip, but rarely both.

   I have concluded that the one which trips happens to be the one that is more sensitive.

   I've never knowingly run into a situation where 2 gfi's cancelled one another out

   I probably test 10 - 15 gfi's a day, and run into doubled gfi's about every 2 weeks +/-.

   I think the instructor is wrong.

   I also think it's a bad practice becasue

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   Sojourners: Christians for Justice and Peace