It is currently Mon Jul 06, 2020 6:57 pm



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Test Leads
PostPosted: Tue Dec 31, 2013 12:14 pm 
Plasma Level
User avatar

Joined: Wed May 07, 2008 5:00 pm
Posts: 822
Location: Rutland, VT
I ran across this statement in a report I was reading and thought might be interesting to post for discussion:

"By mutual agreement it was determined that while instrument test leads are a shock hazard and may be capable of imitating a flash event test leads in and of themselves do not constitute a flash hazard capable of causing the onset of a 2nd degree burn."

The test leads are what you would find with a quality industrial type multimeter.

I believe the discussion is just on the leads themselves causing an arc flash and not that the meter is set on the wrong function and explodes, i.e. performing voltage check with meter set to current scale.

_________________
Barry Donovan, P.E.
www.workplacesafetysolutions.com


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed Jan 01, 2014 2:54 pm 
Plasma Level
User avatar

Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
If they are a shock hazard then they should not be used. That's part of the point of using test leads instead of just cutting and trimming out open wires!

Second though, the statement that they are not a flash hazard in and of themselves is absolutely true of EVERY electrical component, it is the whole "system" that becomes a flash hazard. Without an energy source, a wire (test lead) is not enough. Without wiring, energy sources are not in and of themselves sources of flash hazards. So this statement is a tautology.

In the tests that were used as the basis for the current IEEE 1584 empirical calculation standard, a #14 wire was placed between electrodes to initiate the arc. Effectively, it is a "fuse". More recent work has determined that in low energy conditions (low V*I), a smaller gauge wire is necessary to get an arc flash in the first place. Clearly test leads would work just as well if used as the "fuse".


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 7 hours


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
© 2019 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883