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Electrical Wiring #4520
09/29/01 03:28 PM
09/29/01 03:28 PM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Look here for some suggestions on electrical wiring.
http://urbanideas.com/



[This message has been edited by Joe Tedesco (edited 02-08-2003).]


Joe Tedesco, NEC Consultant
Work Gear for Electricians and the Trades
Re: Electrical Wiring #4521
09/29/01 04:46 PM
09/29/01 04:46 PM
A
Anonymous
Unregistered

Quote
“You use the cold pipe because it goes directly outside into the ground,” Mike says.


Oh, well. Some people never learn.
The misinformation just goes on and on...

Re: Electrical Wiring #4522
09/29/01 04:50 PM
09/29/01 04:50 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
The use of a water pipe as a grounding electrode was outlawed by the IEE here as far back as the 1966 edition due to the increasing use of plastic pipes and couplings. Even the 1955 notes state that caution should be used and to check.

Re: Electrical Wiring #4523
09/29/01 05:14 PM
09/29/01 05:14 PM
A
Anonymous
Unregistered

Yes, but my point is that the current needs to get to the EGC, into the service panel, and onto the GC back to the xfrmr. Getting to the earth outside the window is not what grounding is all about.

Ya do th'hokey-pokey and ya turn yerself aroun'...

Re: Electrical Wiring #4524
09/29/01 05:16 PM
09/29/01 05:16 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
Quote
(GFI's)They are designed to trip (shut off) as little as 240 milliamps of voltage in 0.025 seconds.


That number (240ma) is way high! (60 times!)

On the subject of the DIY avice: One of my peeves is that too many people tend to over-simplify things to the point where just about anyone thinks that they can do anything without a second thought. I'm sure that it causes many a dangerous situation.

Bill

[This message has been edited by Bill Addiss (edited 09-29-2001).]

Re: Electrical Wiring #4525
09/29/01 05:59 PM
09/29/01 05:59 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
Originally posted by Dspark:
Yes, but my point is that the current needs to get to the EGC, into the service panel, and onto the GC back to the xfrmr. Getting to the earth outside the window is not what grounding is all about.

Ah... Our different grounding systems again! I guess if the pipe used to ground a receptacle was properly bonded to the N-G busbar it would be OK, but it seems kind of tacky. And someone might come along later and cut out part of that pipe and insert a plastic coupling.

Ya do th'hokey-pokey and ya turn yerself aroun'...
"Hokey-cokey" here, for anyone who's remotely interested!

Bill:
I see these over-simplified explanations here regularly. I'm always saying to myself, "Ah, yes, but..."

Re: Electrical Wiring #4526
09/29/01 06:50 PM
09/29/01 06:50 PM
A
Anonymous
Unregistered

So now milliamps measure voltage??

Leak 250 milliseconds of 240 milliamps of voltage and the breaker will stumble and fall (trip).

Re: Electrical Wiring #4527
09/29/01 07:12 PM
09/29/01 07:12 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
oops,

I missed the Voltage part [Linked Image]
Voltage and Current get mixed up a lot from what I see. The time factor is probably off too. I think I've heard 1/10th second response time. Does anyone know?

Re: Electrical Wiring #4528
09/29/01 08:56 PM
09/29/01 08:56 PM
N
nesparky  Offline
Member
Joined: Jun 2001
Posts: 642
omaha,ne
I wish there was a way to get these jerks out of the electrical business. Ignorance gets it's own reward.


ed
Re: Electrical Wiring #4529
09/30/01 10:37 AM
09/30/01 10:37 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
I've sometimes heard the "experts" in big DIY stores giving bad advice to customers. If it's something that could be dangerous, I'll step in and try to straighten it out.

Whether they'll take notice or not, I don't know, but at least I tried.

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