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  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

    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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