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Contact Measurements at 34.5kV?

Discussion in 'Electrical Safety Practices' started by K2QO, Jul 7, 2010.

  1. K2QO New Member

    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
    K2QO, Jul 7, 2010
    #1

  2. cbauer Well-Known Member

    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.
    cbauer, Jul 7, 2010
    #2

  3. acobb Well-Known Member

    How bout a visible locked disconnect and grounds? By visible I mean an air break switch that you can see as open.
    acobb, Jul 8, 2010
    #3

  4. cbauer Well-Known Member

    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?
    cbauer, Jul 8, 2010
    #4

  5. acobb Well-Known Member

    Is this overhead, underground, or a combination of both?
    acobb, Jul 8, 2010
    #5

  6. cbauer Well-Known Member

    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.
    cbauer, Jul 8, 2010
    #6

  7. acobb Well-Known Member

    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!
    acobb, Jul 8, 2010
    #7

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