Non-Contact DC (not AC) Detector Pen type - Electrician Talk - Professional Electrical Contractors Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion


Like Tree15Likes
Reply
 
Thread Tools Display Modes
Old 08-30-2017, 05:45 AM   #1
Junior Member
 
Join Date: Oct 2012
Location: NJ
Posts: 3
Rewards Points: 12
Default Non-Contact DC (not AC) Detector Pen type

Dear Experts

I have one AC detector pen type.

Is there a Non-Contact DC detector pen type ?

I tried to search google but didn't find much

http://forums.mikeholt.com/showthread.php?t=119989

Thanks
zillah is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE


Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Advertisement
 
Old 08-30-2017, 06:23 AM   #2
Hackenschmidt
 
splatz's Avatar
 
Join Date: May 2015
Location: Parts Unknown
Posts: 8,499
Rewards Points: 4,396
Default

The extech in the thread you linked doesn't work non-contact.

I do not believe there is a field there to detect around a wire with a DC voltage but no current flowing. That's why the AC ones don't work with DC.

I think if you want a non-contact tester for DC you might have to invent it.
MechanicalDVR likes this.
__________________
Everything Should Be Made as Simple as Possible, But Not Simpler
splatz is offline   Reply With Quote
Old 08-30-2017, 11:54 AM   #3
Old Grumpy Bastard
 
MechanicalDVR's Avatar
 
Join Date: Dec 2007
Location: "Old Dominion"
Posts: 59,528
Rewards Points: 1,468
Default

Quote:
Originally Posted by splatz View Post
The extech in the thread you linked doesn't work non-contact.

I do not believe there is a field there to detect around a wire with a DC voltage but no current flowing. That's why the AC ones don't work with DC.

I think if you want a non-contact tester for DC you might have to invent it.


Think of the profits that could be made!!!
__________________
I'm as Christian as possible in the times we live in.

Always just a stallion in a china shop
MechanicalDVR is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-30-2017, 12:45 PM   #4
Senile Member
 
macmikeman's Avatar
 
Join Date: Jan 2007
Location: Honolulu
Posts: 27,128
Rewards Points: 16,615
Default

A tech guy once gave me a funny looking little non contact dc tester. It worked . I tested it on vehicle wiring. I believe it was sold at Graybar. I don't know what became of it, probably tossed during last van upgrade. I've seen it on the display at Graybar before. The thing lights up blue upon detection.
MikeFL likes this.
__________________
Just days before China unveiled a nuclear weapon that can "strike the US within 30 minutes with ten warheads" as part of a giant military parade, US Major General Lori Reynolds announced she's declaring "diversity" is a "warfighting necessity" which will help America defeat the more homogeneous nations of China and Russia.
macmikeman is offline   Reply With Quote
Old 08-31-2017, 07:21 PM   #5
Senior Member
 
Join Date: Jun 2010
Location: Brisbane, Australia.
Posts: 2,886
Rewards Points: 2,406
Default

QUOTE - I do not believe there is a field there to detect around a wire with a DC voltage but no current flowing. That's why the AC ones don't work with DC. ]

Even on an AC line and no current flowing there is no field.
AC with current = YES field.
DC with current = YES field.
dmxtothemax is offline   Reply With Quote
Old 08-31-2017, 08:07 PM   #6
Registered Member
 
Join Date: Feb 2008
Location: Alabama
Posts: 11,885
Rewards Points: 1,360
Default

Yes an electric field exists around any conductor with a voltage across it.

I believe both Fluke and Extech have an NC detector that will detect AC and DC. The range is something like 48 V minimum... I think.
RePhase277 is offline   Reply With Quote
Old 08-31-2017, 08:13 PM   #7
Modérateur
 
frenchelectrican's Avatar
 
Join Date: Mar 2007
Location: Philippines
Posts: 8,635
Rewards Points: 16,782
Default

Quote:
Originally Posted by RePhase277 View Post
Yes an electric field exists around any conductor with a voltage across it.

I believe both Fluke and Extech have an NC detector that will detect AC and DC. The range is something like 48 V minimum... I think.
I thought they were rated to work low as 24 volts but I was not sure if that is correct model.
__________________
Bleu est beau.
frenchelectrican is offline   Reply With Quote
Old 08-31-2017, 08:28 PM   #8
Senior Member
 
Bird dog's Avatar
 
Join Date: Oct 2015
Location: South East US
Posts: 5,088
Rewards Points: 1,944
Default

Google "non contact dc voltage tester".
__________________
Popcorn munching forum observer
"The supreme art of war is to subdue the enemy without fighting." Sun Tzu
Bird dog is offline   Reply With Quote
Old 08-31-2017, 09:38 PM   #9
Band Member
 
emtnut's Avatar
 
Join Date: Mar 2015
Location: Eastern Ontario
Posts: 5,822
Rewards Points: 1,222
Default

I don't see anyone posting a link to an actual DC non-contact tester !

They don't exist

As Splatz said, in a DC circuit with no current flowing, there would be no field.


When there is current flowing in a DC circuit, there are electrons flowing, and that's why my DC amprobe works !
eddy current and splatz like this.
__________________
_____________________________________
Your Mother was a hamster, and your father smells of Elderberries. ... Now go away, or I shall taunt you a second time
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
emtnut is offline   Reply With Quote
The Following User Says Thank You to emtnut For This Useful Post:
splatz (09-01-2017)
Old 09-01-2017, 06:17 AM   #10
Hackenschmidt
 
splatz's Avatar
 
Join Date: May 2015
Location: Parts Unknown
Posts: 8,499
Rewards Points: 4,396
Default

Quote:
Originally Posted by dmxtothemax View Post
Quote:
Originally Posted by splatz
- I do not believe there is a field there to detect around a wire with a DC voltage but no current flowing. That's why the AC ones don't work with DC.
Even on an AC line and no current flowing there is no field.
AC with current = YES field.
DC with current = YES field.
I believe there is an electrical field that's there whenever there's a charge, and a magnetic field when there's a current, but as far as why there are no DC NCVTs but there are AC ones, that I do not know.

There are lots of NCVTs that will sound off for low voltage AC, I know Santronics makes one, Klein and Fluke too. I googled and did not find any DC NCVTs.
eddy current likes this.
__________________
Everything Should Be Made as Simple as Possible, But Not Simpler
splatz is offline   Reply With Quote
Old 09-01-2017, 08:16 AM   #11
Senior Member
 
Join Date: Feb 2009
Location: Canada
Posts: 5,129
Rewards Points: 7,520
Default

Yes DC has a field, but it is not moving like AC.

I assumed the non contact testers relied on an alternating field?
MechanicalDVR likes this.
eddy current is offline   Reply With Quote
Old 09-01-2017, 08:20 AM   #12
Senior Member
 
Bird dog's Avatar
 
Join Date: Oct 2015
Location: South East US
Posts: 5,088
Rewards Points: 1,944
Default

Maybe the better Q is why does the OP need this esoteric device?
MechanicalDVR likes this.
__________________
Popcorn munching forum observer
"The supreme art of war is to subdue the enemy without fighting." Sun Tzu
Bird dog is offline   Reply With Quote
Old 09-01-2017, 09:43 AM   #13
Senior Member
 
Join Date: May 2015
Location: Sacramento, California
Posts: 13,953
Rewards Points: 26,152
Default

There are VERY few DC circuits running at power levels ... versus 24 VDC and less.

Who the HECK cares about 24VDC ?
telsa is offline   Reply With Quote
Old 09-01-2017, 02:08 PM   #14
Old Grumpy Bastard
 
MechanicalDVR's Avatar
 
Join Date: Dec 2007
Location: "Old Dominion"
Posts: 59,528
Rewards Points: 1,468
Default

Apparently there used to be an Extech 401050 but it's discontinued now.
__________________
I'm as Christian as possible in the times we live in.

Always just a stallion in a china shop
MechanicalDVR is offline   Reply With Quote
Old 09-01-2017, 02:13 PM   #15
Senior Member
 
Join Date: Oct 2012
Location: Alberta Rockies
Posts: 2,721
Rewards Points: 3,800
Default

Quote:
Originally Posted by telsa View Post
There are VERY few DC circuits running at power levels ... versus 24 VDC and less.

Who the HECK cares about 24VDC ?
Those that are troubleshooting it? lol..
I have a couple times when a 24vdc non contact tester would be handy, but there 's too many variables that I wouldn't trust it.. What if you were testing a wire in a box and it was on an open switch? Not accurate enough to pin point which conductor is hot in a group of 2 or more? I'll stick with my 87 for troubleshooting..
MechanicalDVR and telsa like this.
glen1971 is offline   Reply With Quote
Old 09-01-2017, 02:22 PM   #16
Old Grumpy Bastard
 
MechanicalDVR's Avatar
 
Join Date: Dec 2007
Location: "Old Dominion"
Posts: 59,528
Rewards Points: 1,468
Default

Quote:
Originally Posted by glen1971 View Post
Those that are troubleshooting it? lol..
I have a couple times when a 24vdc non contact tester would be handy, but there 's too many variables that I wouldn't trust it.. What if you were testing a wire in a box and it was on an open switch? Not accurate enough to pin point which conductor is hot in a group of 2 or more? I'll stick with my 87 for troubleshooting..
Yeah I'm much more trusting of a meter myself for troubleshooting.
glen1971, telsa and Bird dog like this.
__________________
I'm as Christian as possible in the times we live in.

Always just a stallion in a china shop
MechanicalDVR is offline   Reply With Quote
Old 09-01-2017, 04:05 PM   #17
Senior Member
 
Join Date: May 2015
Location: Sacramento, California
Posts: 13,953
Rewards Points: 26,152
Default

At high DC power levels, iron filings inside a vial ( like a pharmacy's ) would move like crazy to align with the DC field.

It would be rather hard to patent, though.

And then there's a COMPASS.

That puppy will spin like crazy to align with a DC field.
glen1971 likes this.
telsa is offline   Reply With Quote
Old 09-01-2017, 07:46 PM   #18
Hackenschmidt
 
splatz's Avatar
 
Join Date: May 2015
Location: Parts Unknown
Posts: 8,499
Rewards Points: 4,396
Default

Quote:
Originally Posted by MechanicalDVR View Post
Apparently there used to be an Extech 401050 but it's discontinued now.


https://www.amazon.com/Extech-401050...ct_top?ie=UTF8

I don't think it's non contact for dc, the tip is uninsulated.
MechanicalDVR likes this.
__________________
Everything Should Be Made as Simple as Possible, But Not Simpler
splatz is offline   Reply With Quote
The Following User Says Thank You to splatz For This Useful Post:
telsa (09-02-2017)
Old 09-01-2017, 08:51 PM   #19
Old Grumpy Bastard
 
MechanicalDVR's Avatar
 
Join Date: Dec 2007
Location: "Old Dominion"
Posts: 59,528
Rewards Points: 1,468
Default

Quote:
Originally Posted by splatz View Post


https://www.amazon.com/Extech-401050...ct_top?ie=UTF8

I don't think it's non contact for dc, the tip is uninsulated.
I just saw it listed when I googled DC NCVT.
__________________
I'm as Christian as possible in the times we live in.

Always just a stallion in a china shop
MechanicalDVR is offline   Reply With Quote
Old 09-02-2017, 04:57 PM   #20
Senior Member
 
Join Date: May 2015
Location: Sacramento, California
Posts: 13,953
Rewards Points: 26,152
Default

A compass certainly is non-contact.
Bird dog likes this.
telsa is offline   Reply With Quote
Reply

Thread Tools
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
Dry contact to initiate a residential smoke alarm? Navyguy General Electrical Discussion 8 05-06-2017 09:23 AM
480VAC Coil and 250VAC Rated Contact NJWVUGrad General Electrical Discussion 5 09-19-2016 02:58 PM
SO Type Cords That Do Not Fall Apart After Years? Jerome208 General Electrical Discussion 23 06-06-2016 08:52 AM
Non contact and clamp meter suggestions? 120ToTheFingers Tools, Equipment and New Products 21 05-25-2016 09:50 PM
Upgrading and outdoor screw-in fuse box to a circuit breaker type box Jimmi328 Residential Electrical Forum 2 03-26-2016 08:09 PM


All times are GMT -4. The time now is 09:29 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com