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Re: non-contact voltage testers #52060 05/19/05 06:48 AM
Joined: Mar 2005
Posts: 88
JFLS41 Offline
I trusted a Greenlee voltage pen once and my dikes have a jagged wire stripper built in now. These voltage testers chirp when you shake them. I don't trust them for nothing.

Work Gear for Electricians and the Trades
Re: non-contact voltage testers #52061 05/19/05 09:49 AM
Joined: May 2005
Posts: 2
trode Offline OP
Junior Member
Let me get this right. Most you people would stick your hand on a 600 volt motor starter or whatever as long as the volt pen said it was de-energized. And your sure it worked because you rubbed it on your shirt?
I hope your insurance is paid up.

Re: non-contact voltage testers #52062 05/19/05 01:25 PM
Joined: Jul 2002
Posts: 717
macmikeman Offline
I am not sure what causes it but one really wierd thing I have seen more than once is that my non contact voltage testers when used in old houses with knob and tube or old two wire romex sometimes will give me continuous voltage readings off the wooden walls, door jambs or whatever else in the house I touch them near. I figure that this must be inductance or capacitence, from how they used to wire three ways with two wire cables for travellers and the hots and neutrals for same on different circuits. Anybody else ever see this or know why?

Re: non-contact voltage testers #52063 05/19/05 03:33 PM
Joined: Jan 2003
Posts: 4,391
iwire Offline
Let me get this right. Most you people would stick your hand on a 600 volt motor starter or whatever as long as the volt pen said it was de-energized. And your sure it worked because you rubbed it on your shirt?

The answer to your question for me is yes, without a doubt.

I ask again, what is a non-contact voltage checker for if you can not use it to check for voltage.

I also would like an explanation why some feel a typical digital or analog multimeter is a more reliable method to check for power?

In my mind the most common problem with meters is broken leads. Not a problem with a non contact tester.

Next we have complexity, the more complex an item is the more likely it is to break.

I can see no reason to 'trust' a multimeter more than the non-contact tester for simple "is it on or is it off" type use.

Do you all 'trust' your amprobe?

It is a non-contact device that is very reliable. [Linked Image]

Bob Badger
Construction & Maintenance Electrician
Re: non-contact voltage testers #52064 05/19/05 04:11 PM
Joined: Mar 2005
Posts: 1,803
Alan Belson Offline
Very interesting point. Even when fully kiln-dried, timber contains about 6% moisture, not far off ONE AND A HALF PINTS PER CUBIC FOOT in pine! In older houses in summer it might rise to 12%-15%, falling to perhaps 6-10% in the heating months, but in older damper houses it might be as high as 20%, and has to be this high for fungus attacks to proceed. The water is 'locked' into the twisted cellulose fibres of the wood, takes considerable energy to remove, and there is a gradient rising toward the centre. Larger, particularly oak, timbers never dry out fully, and on a big beam, such as in an old church, the core will be as wet as the day the tree was felled, perhaps as high as 50%! So if these pens are very sensitive, they may well detect stray currents in a quite dry-seeming to the touch timber structure with K&T. As an aside, wood also moves dimensionally when moisture content changes, so a woodworker has to allow for it in every object he makes, ( hence panels in doors), an unwanted complication!

Wood work but can't!
Re: non-contact voltage testers #52065 05/19/05 05:14 PM
Joined: Aug 2003
Posts: 99
richard Offline
I think the "tic tracer" is a great tool, and use it all the time, but I carry a wiggie with me when I am working, and use it as well.

Re: non-contact voltage testers #52066 05/19/05 05:34 PM
Joined: Nov 2000
Posts: 2,148
resqcapt19 Offline
All testers must be tested on a known live circuit both before and after testing the circuit to be worked on. If you are using the noncontact tester on a bare terminal, it will be ok, but there are cases where they will tell you the conductor/cable is dead when it is infact live. This can occur in tightly twisted conductors, or in cables like NM or SO that have paper inside the outer jacket if the paper is wet. I have even seen this with single conductor USE in wet earth.
PS: I only use my wiggy to test anything that I will be touching with my hands or tools, and I test it before and after on a known live circuit of the same voltage.

Re: non-contact voltage testers #52067 05/20/05 12:13 PM
Joined: May 2005
Posts: 8
chrsb Offline
Junior Member
I have had my volt tic fail working of roofs of tall buildings. It was a moist day and I was 10 stories up, tested a couple duplexes, got the cutters out and now they are retired. I had this happen a couple times after that, but learned my lesson the first time.

Re: non-contact voltage testers #52068 05/20/05 03:24 PM
Joined: Sep 2001
Posts: 806
NJwirenut Offline
I have never had my noncontact probe (a Fluke, FWIW) show a false negative, but false positive indications are pretty common, especially in proximity to other energized circuitry above 120V to ground.

I have converted a pair of dikes into a wirestripper by relying on (somebody else's) voltmeter, though. Open conductor inside the insulation of one of the test leads....

In addition to the pre-use check on a known energized circuit, a periodic check of the meter's leads using the continuity beeper is recommended.

Re: non-contact voltage testers #52069 05/20/05 04:18 PM
Joined: Mar 2001
Posts: 2,056
Redsy Offline
See this:

Note the date of the initial topic.
Has anything changed?

[This message has been edited by Redsy (edited 05-20-2005).]

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