high zs | Page 4

high zs

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  1. S

    High Zs on cct

    Hi all, I have a circuit on a db we have installed which is a long run of cable, the R1+R2 comes out at 1.26 and the Zs is 1.24 , this is on a C20 RCBO, the maximum Ze according to the regs for the MCB side is 1.20 . I know it complies as its RCD protected but how do i put it down on the test...
  2. A

    Slightly high ZS reading

    Hi Have installed a new ring circuit - for a kitchen - lots of points (19 in total) - TNS earthing, max ZS should be 1.16 - I'm getting 1.41 - have checked tightness of all terminations and all are good anyone got any ideas? Cheers
  3. B

    High Zs reading how to rectify

    Hi Guys Just wondering again your thoughts on the following if you have a high Zs reading, what is the best way of rectifying it. say you have a BS60898 mcb type b 32a max Zs is 1.15 ohm. So if you took a reading when measured of say 2.23 ohms what is the best to fix this or remedy it. I...
  4. R

    High Zs readings

    Hi, can anyone help? I've recently carried out a PIR on a school building which has 1 main distribution board supplying 9 other distribution boards around the school. Most of the installation is fine except for a number of circuits which have higher than normal Zs readings according to the...

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