ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
doc 3
Recent Posts
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,012 Are you busy
175,618 Re: Forum
167,851 Need opinion
Who's Online Now
0 registered members (), 58 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#199548 - 03/01/11 01:48 PM Non CAT III Rated Meter  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
Would using fused test leads rated at CAT III 1000V, CAT IV 600V, 10A allow use of an older non CAT III Rated meter on a jobsite as far as OSHA or NFPA 70E is concerned or would they still be considered only as supplemental protection?
Fused Test Leads



Arc Flash PPE Clothing, LOTO & Insulated Tools

#199551 - 03/01/11 03:22 PM Re: Non CAT III Rated Meter [Re: KJay]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,858
Brick, NJ USA
Kjay:
A quick read of the link info, I may say 'Yes'
However, personally...I would speak to a Fluke rep/engineer.
The link read leads me to believe the probes will provide a safe means of testing.



John

#199576 - 03/02/11 12:01 AM Re: Non CAT III Rated Meter [Re: KJay]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,217
SI,New Zealand
Originally Posted by KJay
Would using fused test leads rated at CAT III 1000V, CAT IV 600V, 10A allow use of an older non CAT III Rated meter on a jobsite as far as OSHA or NFPA 70E is concerned or would they still be considered only as supplemental protection?

In my opinion, no.
After all the device that is being connected to a source of voltage or current is effectively the meter, the test leads are only a wire link, fused or not.
What the CAT rating is used for, is safety against voltage surges and spikes, these inherently will not blow a fuse and can expose the user of such a meter to fire and explosion hazards.

Have a read of this article from EC&M


Let's face it, these days if you're not young, you're old - Red Green grin

#199596 - 03/02/11 12:57 PM Re: Non CAT III Rated Meter [Re: Trumpy]  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
Originally Posted by Trumpy
Originally Posted by KJay
Would using fused test leads rated at CAT III 1000V, CAT IV 600V, 10A allow use of an older non CAT III Rated meter on a jobsite as far as OSHA or NFPA 70E is concerned or would they still be considered only as supplemental protection?

In my opinion, no.
After all the device that is being connected to a source of voltage or current is effectively the meter, the test leads are only a wire link, fused or not.
What the CAT rating is used for, is safety against voltage surges and spikes, these inherently will not blow a fuse and can expose the user of such a meter to fire and explosion hazards.

Have a read of this article from EC&M




That could very well be the case. I suppose a non CAT rated meter would likely have a low impedance design as well. Some of the statements in that article still have me wondering though.
Would it seem logical that the test leads being fused at 10A would be the first in line to see the increased current and could potentially open faster than the internal protection in the meter would, so in essence preventing any further damage?

The more I read on the subject, the more it seems that these safety ratings are contemplating complete and absolute blissful ignorance on the part of the person using the test equipment. So much so, it appears that they group test equipment users into the in the realm of unqualified amateur. Apparently these days, it really is too much to ask for an individual to be competent in the things he does and equipment he works with on a daily basis.



Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.002s) Memory: 0.7638 MB (Peak: 0.8989 MB) Zlib enabled. Server Time: 2017-08-21 04:50:36 UTC