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  1. zone77

    volt drop query

    When doing a volt drop calc for a sub board, is the max volt drop 5%(11.5v) ( the sub board feeds lighting and power circuits) or is it reduced to 3% (6.9v):confused:
  2. L

    very low pfc on submain board

    hi all hoprfully someone here can answer this question for me: i tested a sub mains today and i only got 0.35 KA is this normal for a submains as at the main mainsboard the pfc is 3.3 KA the main fuseboard has a rcd main switch so at the submain i had to use no trip pfc not sure is this makes...
  3. A

    Testing for ze on a submain cable?

    hello chaps i'm going to be doing some final live tests in a block of flats were doing at the mo on monday and was trying to remember what earth cable to test on for Ze in the flats consumer unit. The flats are fed by a 16mm t+e submain with an additional 16mm earth run along with it. now do i...

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