1. Welcome to the Arc Flash Forum - A Global Community for Arc Flash and Electrical Safety!

    Register today and join the conversation! As a registered member you can:

    • Create your detailed user profile
    • Post questions and responses
    • Add a profile photo of yourself
    • Become a contributor to the Library
    • Provide status updates about yourself
    • Receive weekly email updates
    • "Like" the forum on Facebook
    • "Like" other member's posts
    • ...and much more!

    Learn More About the Arc Flash Forum Here

Underground Manhole Systems

Discussion in 'NESC - ANSI C2 - National Electrical Safety Code' started by wmok82, Mar 20, 2009.

  1. wmok82 Junior Level

    All -

    What are you guys doing with respect to your UG manhole systems? Specifically, if you have calculated energies, what are you doing with PPE?
    wmok82, Mar 20, 2009
    #1

  2. stevenal Sparks Level

    stevenal, Apr 1, 2009
    #2

  3. acobb Sparks Level

    One other issue to consider. Years ago I was in a small vault checking on some equipment when I noticed a portion of cable had "blown out" at some point allowing an energized 7,200 volt aluminum cable to be exposed. Somehow it was still operating. Didn't hang around very long!
    acobb, Apr 1, 2009
    #3

  4. haze10 Sparks Level

    Enter manhole in HRC4. Check all cables with tic tracer. No live voltage found exit manhole and re-enter in HRC2.

    De-energizing is often not practical. How many square miles of city is it acceptable to de-energize before inconvienence become infeasible?

    Most manhole accidents to not occur because there was a conincidental fault on an adjacent cable. Most are from touch an energized conductor, by accident.
    haze10, Apr 1, 2009
    #4

Share This Page