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Recent content by BL1

  1. BL1

    Copper Wire Braiding vs. Stranded Wire

    Hi all, There is a question that has arisen at my work place concerning frame grounding of 110v/220v frames,cabinets,plc racks,and such like. Is it more reasonable to use wire braid for framing or continue with stranded wire.There seems to be a benefit to braid because of lightning dissipation...
  2. BL1

    Auto-transformer starting

    We are about to install a 10ft fan with a 2500hp motor.We are going to use an auto-transformer (5000kva) to supply the motor.This will be used to ventilate a large mine with multiple coal seams.We will eventually add another fan of the same.My question: are there any draw backs to using...
  3. BL1

    motor failure

    Just a thought.Just wondering actually.Nema design letter and the service factor designation? Were those on the name plate as well?
  4. BL1

    Spline Balls on Transmission Lines

    SUBTECH---WE'RE TALKING OLD SCHOOL AND GETTING THE JOB DONE.SUPERB.WORDS TO ENGINEER BY.A STAR--THANKS.
  5. BL1

    Mine ground systems

    TULUM, THIS MIGHT HELP.CHECK OUT MSHA HANDBOOK ON THEIR WEBSITE AT WWW.MSHA.GOV.UNDER SEARCH USE PH93-V-7.THIS SHOULD BE THEIR ELECTRICAL INSPECTORS GUIDE LINES.HOPE THIS IS OF SOME BENEFIT TO YOU.BEST REGARDS. BL1(MINING)
  6. BL1

    auto-transformer for grounding purposes

    My question is:can an auto-transformer (not a zig-zag) derive a netural for a high resistance grounded system? If so,what are the limitations and if not,why? Thanks in advance for any ideas or thoughts on this subject.
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