Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-21-2008, 03:40 PM   #16
Licensed Electrician
 
Join Date: Oct 2008
Location: Virginia
Posts: 25
Share |
Default

Yes another grounding question


Quote:
Originally Posted by Speedy Petey View Post
This current can be through a human or simply flowing into the earth. The GFI doesn't care.
I don't want to sound like I'm splitting hairs, but it needs to be remembered that there is a difference between GFCI and GFI.
GFCIs are for protection of personnel and trip at a low value (<5mA?). GFIs are used for the protection of equipment and trip at a higher current....30mA, I believe.
Speedy's comment is right on about the current flow through a human or into the earth. The GFCI doesn't know and doesn't care; in fact it pretty much operates on an assumption. It looks for an unbalance between the hot and neutral. If it senses that unbalance, it trips. The assumption is the current is going to ground because there is no where else for it to go. That's why you don't need a grounding conductor hooked up to a GFCI outlet for it to operate.

Tuckahoe Sparkplug is offline   Reply With Quote
Old 10-21-2008, 08:11 PM   #17
My License Ain't 4 Sale..
 
Join Date: Feb 2008
Location: Atlanta, Ga/Hamilton, Al
Posts: 1,813
Default

Yes another grounding question


Quote:
Originally Posted by Tuckahoe Sparkplug View Post
I don't want to sound like I'm splitting hairs, but it needs to be remembered that there is a difference between GFCI and GFI.
GFCIs are for protection of personnel and trip at a low value (<5mA?). GFIs are used for the protection of equipment and trip at a higher current....30mA, I believe.
Actually, GFI and GFCI are the same thing. The term, as it is used in the code, is "Ground Fault Circuit Interrupter", but alot of electricians, especially those east of the Mississippi, drop the "Circuit" out of it, and just say GFI. If I'm talking to another electrician, I would say GFI. If I'm talking to a customer, or DIY'r here, I say GFCI.

What you are referring to above is "Ground Fault Protection of Equipment", or GFPE. The GFCI in the kitchen and bath is "Ground Fault Protection of Personnel". An electrician would call either of these a GFI.
InPhase277 is offline   Reply With Quote
Old 10-21-2008, 08:51 PM   #18
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,779
Default

Yes another grounding question


Tuck, InPhase is right on with his explanation of GFCI and GFPE.

__________________
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.
Speedy Petey is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hot Tub GFCI Grounding Question kearnak1420 Electrical 3 04-30-2008 05:48 PM
Sub-panel grounding question. gesoneguy Electrical 31 02-22-2008 08:25 AM
Anyone want to take a shot at why #6 to attach antenna ground to breaker? Piedmont Electrical 44 01-08-2008 04:11 PM
Another Dumb question - Self grounding outlets robertmee Electrical 9 10-25-2007 01:49 PM
Question on Grounding ayudi General DIY Discussions 2 12-11-2006 04:14 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.