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  1. R

    Zs on 3 phase board.

    Sharpend sorry i made mistake.  On 5th floor board L2 and L3 are 0.09 and 0.08 ohms. 
  2. R

    Zs on 3 phase board.

    Hi ppl.  This is my 1st post but not last i hope!  I'm testing a small site the location is on 5th floor.  Its new installation but building is existing - so is the electrical source of all building. Down in basemant its 11 Kv and 3 step down transformers to 400. They have UPS and "dirty...
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