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Maximum Earth Loop Impedance Info

Discussion in 'Electrical Engineering' started by SteveJ, Mar 3, 2004.

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  1. SteveJ

    SteveJ Guest

    Could some one clarify the position on the tables to be used when assessing
    the actual zs readings against the max permissible in BS7671. The tables in
    the on site guide are obviously reduced by 20% to account for certain
    factors but the tables in 7671 do not have the formulae applied. When
    assessing the actual readings against the permissible and an assumption is
    made that the average ambient temp is within 10 > 20 OC could the 7671 table
    be used as the reference. I understand that although the NIEIC table
    within the front cover of the inspection pads is factored the inspectors do
    not recommend using that but refer you to the 7671 tables. I have an
    element of confusion here and would appreciate guidance on this matter.

    Many thanks
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