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#71921 - 11/10/06 05:50 PM Circuit tester  
Taylor  Offline
Junior Member
Joined: Nov 2006
Posts: 2
Salem, Oregon, USA
Does anyone know how sensitive those little three prong circuit testers are? We were using them to confirm ground in the 110 outlets in our plant, but recently discovered that they can be misleading. One of them registered a gound ok but the ground measured 1700 ohms. We are now, of course, going around with a proper VOM rechecking all receptacles.


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#71922 - 11/10/06 07:44 PM Re: Circuit tester  
Zapped  Offline
Member
Joined: Oct 2002
Posts: 482
Huntington Beach, CA, USA
IMHO, I wouldn't use one of the cheapo ones for anything commercial at all.


#71923 - 11/10/06 10:14 PM Re: Circuit tester  
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
Those testers use neon bulbs, which can light on a milliamp or less of current flow. They tell you only that there is some kind of path to ground, not that it is a GOOD path.


#71924 - 11/13/06 05:52 PM Re: Circuit tester  
Taylor  Offline
Junior Member
Joined: Nov 2006
Posts: 2
Salem, Oregon, USA
Thanks guys. We are no longer using these things in the plant. I never really thought much of them anyway, but we were sucked in by OSHA. There field agents use these same chepo gadgets to check for grounds during their investigations.


#71925 - 11/13/06 07:39 PM Re: Circuit tester  
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand
In New Zealand we use the AVO-Megger LT 310 Loop Impedance Tester on the 230 volts MEN system.
The best way to test is to use a loop impedance tester instead of relying on neons which can give you false readings.
This one imposes a test current between the phase and neutral and earth.
It will tell you in Ohms and kiloAmps what fault level is available.
it will also confirm that the polarity is correct.


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#71926 - 11/13/06 08:01 PM Re: Circuit tester  
scameron81  Offline
Member
Joined: Feb 2004
Posts: 75
Healdsburg, ca, USA
Check out this interesting link regarding OSHA and their cheapo testers.

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=21410



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