ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Southwire Recalls Electrical Outlet Boxes
by Admin - 08/21/19 06:39 PM
Fuse blower plug?
by HotLine1 - 08/20/19 01:50 PM
100 year old Light Bulb
by HotLine1 - 08/20/19 01:26 PM
Forum Updates Coming Soon.
by Admin - 08/18/19 01:55 PM
Anybody Remember this?
by Bill Addiss - 08/17/19 09:07 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 10 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Gfi's and testers. #169841 10/17/07 09:17 PM
Joined: Mar 2002
Posts: 179
D
derater Offline OP
Member
Could use some insight on this; gfi receptacle trips with 'test' button, but not with a gfi tester. New type that supposedly won't work if wired wrong. Tester is ok. Ideas ?

Work Gear for Electricians and the Trades
Re: Gfi's and testers. [Re: derater] #169843 10/17/07 09:29 PM
Joined: Jul 2004
Posts: 9,383
G
gfretwell Online Content
Member
No ground?


Greg Fretwell
Re: Gfi's and testers. [Re: gfretwell] #169846 10/17/07 10:32 PM
Joined: Oct 2007
Posts: 56
S
SP4RX Offline
Member
I agree with Fretwell. I think that the gfi tester works by allowing a small amount of current to flow from the hot conductor through a resistor to the grounding conductor. So if you have no ground connection at the gfi the tester's ground prong wouldn't have a good return path for the simulated ground fault.
This doesn't mean that the gfi won't work as intended though since it normally compares line current to neutral current, with no need for a ground.
Perhaps you could verify it's correct operation by unscrewing the gfi and, using a separate wire, make a temporary connection to a good remote ground point and then try your tester again?

Shawn.

Re: Gfi's and testers. [Re: SP4RX] #169858 10/18/07 12:54 PM
Joined: Jun 2007
Posts: 301
J
JValdes Offline
Member
The neutral carries the same current as the hot conductor. A ground would be necessary for the GFCI to work properly.

Re: Gfi's and testers. [Re: JValdes] #169859 10/18/07 01:12 PM
Joined: Mar 2005
Posts: 1,213
S
SteveFehr Offline
Member
Originally Posted by JValdes
The neutral carries the same current as the hot conductor. A ground would be necessary for the GFCI to work properly.
The GFCI will still work properly without a ground (hence its acceptability in ungrounded retrofit appliations) but the GFCI tester wouldn't work, as it can't shunt a small amount of current to ground if there's no ground to shunt to. Standing in a puddle and sticking a wet finger into the receptacle aught to do the trick, though. But it's certainly not recommend as the consequences if the test fails are potentially rather dire...

Last edited by SteveFehr; 10/18/07 01:13 PM.
Re: Gfi's and testers. [Re: SteveFehr] #169865 10/18/07 03:56 PM
Joined: Mar 2002
Posts: 179
D
derater Offline OP
Member
Thanks all. That's the case, no ground.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,912
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
GeneSF 7
Popular Topics(Views)
257,952 Are you busy
193,678 Re: Forum
183,291 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3