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  1. G

    rule of thumb ????

    osg has always been .8 and the 16th .75 if the 17th is now .8 i know which i will be using 0.2 regards
  2. G

    Zs formula

    A 300ma Rcd Is Not Used For Personal Protection Its 30ma Max There For The 300ma Would Protect The Whole Installation (fire Protection)and The 30ma For All Things Outside The Equipotential Zone Sorry If Im Missing The Point
  3. G

    Zs formula

    50/0.3 =166.66r Is The Way I Was Taught
  4. G

    HELLO ALL

    HI
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