Author |
Message |
K2QO
|
Post subject: Contact Measurements at 34.5kV? Posted: Wed Jul 07, 2010 6:33 am |
|
Joined: Wed Jul 07, 2010 5:12 am Posts: 1 Location: Clarence, NY
|
Hi Gang,
I'm new here, but not to safety as I'm the Safety Engineer for a major University EH&S department. (I'll admit to being a bit behind the electrical curve as I'm a mechanical PE.)
My question: Following an investigation of a serious arc flash accident, I've had requests that instead of using the traditional non-contact testing, we instead use CONTACT testing. I've never heard of anyone doing this at distribution levels and cannot find any information on the web. I've basically told this person no way, I'm not going to tell our HV electricians to break critical boundaries with conductive test equipment.
Am I missing something?
Thanks,
Mark
|
|
Top |
|
 |
cbauer
|
Post subject: Posted: Wed Jul 07, 2010 6:56 am |
|
Joined: Mon Mar 29, 2010 11:52 am Posts: 110 Location: Yankton SD/ Lead SD
|
To actually follow the wording of 70E in regards to voltage testing, you need to use contact testers. How else would be able to test phase to phase, as well as, phase to ground. That being said, I personnally would use the a proximity tester first and then follow up with the contact tester.
|
|
Top |
|
 |
acobb
|
Post subject: Posted: Thu Jul 08, 2010 6:51 am |
|
Joined: Sun Dec 23, 2007 1:44 pm Posts: 348 Location: Charlotte, NC
|
How bout a visible locked disconnect and grounds? By visible I mean an air break switch that you can see as open.
|
|
Top |
|
 |
cbauer
|
Post subject: Posted: Thu Jul 08, 2010 8:01 am |
|
Joined: Mon Mar 29, 2010 11:52 am Posts: 110 Location: Yankton SD/ Lead SD
|
acobb wrote: How bout a visible locked disconnect and grounds? By visible I mean an air break switch that you can see as open.
I can see the exception for a GOAB switch, but then what do you do when you have a high voltage gear that has several switches and you only want to isolate one circuit?
|
|
Top |
|
 |
acobb
|
Post subject: Posted: Thu Jul 08, 2010 12:33 pm |
|
Joined: Sun Dec 23, 2007 1:44 pm Posts: 348 Location: Charlotte, NC
|
Is this overhead, underground, or a combination of both?
|
|
Top |
|
 |
cbauer
|
Post subject: Posted: Thu Jul 08, 2010 12:51 pm |
|
Joined: Mon Mar 29, 2010 11:52 am Posts: 110 Location: Yankton SD/ Lead SD
|
I believe that K2QO was probably talking about OH stuff. What I was referring to was UG distribution. Strictly speaking, I do not think that proximity meters meet the letter of 70E. What I have reccommended at our facility is that they first use a prox meter, and then for added insurance use the contact meter.
|
|
Top |
|
 |
acobb
|
Post subject: Posted: Thu Jul 08, 2010 4:29 pm |
|
Joined: Sun Dec 23, 2007 1:44 pm Posts: 348 Location: Charlotte, NC
|
Yeah.....I confuse easily these days! I thought he was talking OH but was not sure. With the switchgear problem, I don't get involved with 34.5 UG that much, but I would want a visible break before I had to put on grounds. The mistake of grounding it hot will be exciting to say the least. I saw a friend ground a hot 230 kV one day.....he did just fine with the 8' stick but it was a bit loud. Don't know if he had hearing problems later in life from it though. Someone else will chime in I am sure!
|
|
Top |
|
 |
|
Page 1 of 1
|
[ 7 posts ] |
|
|
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
|
|