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 Post subject: <1kV contact voltage detector self test function
PostPosted: Mon Apr 29, 2019 11:07 am 

Joined: Fri Oct 19, 2018 5:50 am
Posts: 1
For verifying the absence of voltage for Low Voltage (1kV and below), we require a contact voltage detector along with the use of a Proving Unit to functionally test the detector prior to and after verifying the absence of voltage. The proving unit provides a known voltage source of 240V and eliminates the need to locate a known voltage source, which sometimes requires the removal of an energized panel cover to access the known source.

I am now seeing voltage detectors being manufactured with a built-in self test feature. My questions are: Is the self-test a suitable way to functionally test a voltage detector or is this only testing the internal circuitry of the detector? In other words, does the self-test satisfy the requirement for a "Known Voltage Source" in NFPA 70E-2018?

I look forward to any feedback on this issue. Thank you. GL


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Sat May 04, 2019 7:21 pm 

Joined: Fri Jul 10, 2009 10:14 am
Posts: 27
Location: West Central, OH
We require using a test touch as proximity is not allowed. We also test before and after touching with a known source.


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Mon May 13, 2019 3:11 pm 
Sparks Level

Joined: Tue Jul 01, 2014 8:40 am
Posts: 98
Hi GL

When you mention about the "voltage detectors being manufactured with a built-in self test feature". Are you referencing where in 70E it discusses the "Permanent Electrical Safety Device" PESD? I am thinking of the Panduit device that mounts on the door of a panel and runs through its own diagnostics for the presence and absence of voltage? Or are you referencing a multimeeter style device or contact testing device? Not sure how a contact type tester would be able to do a self check without applying on a known energized source


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Tue May 14, 2019 4:44 am 

Joined: Mon Aug 04, 2014 5:19 pm
Posts: 13
In the "old days" of the glow stick and related devices, it was always utility practice to test the integrity before and after on MV and HV circuits.
Regardless of the type test device, I still subscribe to the this philosophy.
thanks Jim


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Mon Aug 19, 2019 10:40 am 
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Joined: Mon Sep 26, 2011 2:17 pm
Posts: 20
Location: Waggaman - Cornerstone Chemical Company
I agree with Jim - test before and after on a known source.

Self-test does not replace, only verifies that the unit is working.

MDV


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Tue Aug 20, 2019 3:40 pm 
Arc Level

Joined: Tue Jan 13, 2009 5:00 pm
Posts: 540
Can you provide a make/model for an example detector?

Can the manufacturer provide assurance that there can be no common failure mode between the source and detection sides of the instrument? The separate Proving Unit will not have share a failure mode with the detector that would cause a false indication.


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 Post subject: Re: <1kV contact voltage detector self test function
PostPosted: Sat Oct 05, 2019 8:05 pm 
Sparks Level

Joined: Sat Nov 21, 2009 10:23 pm
Posts: 110
Location: Ohio
Take a look at the link below, this is an excellent choice for a "Known Source"

https://www.fluke.com/en-us/support/pre ... -arc-flash


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