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Discuss Zs testing in the Periodic Inspection Reporting & Certification area at ElectrciansForums.co.uk.

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  1. pushrod
    Offline

    pushrod Electrician's Arms

    Location:
    leicestershire
    Just wondering if everyone actually does a Zs test when filling in a schedule of results. In the OSG it says that you can measure it or calculate it by addition. I appreciate the different value stuff, just thinking it is a lot easier and quicker to be adding 2 figures together than taking things apart and getting your test meter out again.

    Cheers.
     
  2. johnboy6083
    Offline

    johnboy6083 Band Member Trusted Advisor

    Location:
    South east
    i think calculation is the way to go, as it gives you the worst case scenario. IE, the ZS reading might come in ok, but only because of some supplemantary bonding somewhere giving a better path to earth. In a few years, when the bathroom is changed, and the bonding is removed because it is no longer needed, then you have affected the protection of you original circuit that you measured ZS on.
    Also it reduces the need to work live, as EAWR regs state: you should only work live where it is not reasonably practical not to do so.

    I predict a good debate on this one!
     
    Last edited: Sep 2, 2010
  3. Ponty Massive
    Offline

    Ponty Massive Guest

    I haven't got a D LOC on my tester, too much work taking out the RCD so calculation for me!! :D
     
  4. wirepuller
    Offline

    wirepuller Trusted Advisor

    Location:
    south uk
    I measure when practical...but calculate for RCBo's as they always trip and calculate most of the time on lighting circuits,as most light fittings are not exactly Zs tester friendly....and even if you do manage to connect the probes the ******* 6a type B mcb pops out so you end up calculating anyway.
     
  5. JASON
    Offline

    JASON Electrician's Arms

    Location:
    Button Pressing
    From what i understand, it is acceptable to calculate Zs on a PIR, but not on a new or altered installation.
     
  6. Guest123
    Offline

    Guest123 Guest

    Always measure.
     
  7. widdler
    Offline

    widdler Trusted Advisor

    Location:
    North East

    +1 :cool:
     
  8. mrmatt
    Offline

    mrmatt Guest

    Someone always told me skip whatever test you want but if I find out you skipped the ZS test I'll sack you!

    so always measure
     
  9. Sintra
    Offline

    Sintra The Innkeeper Staff Member

    Location:
    Belfast/London
    I always measure one reason being if you have a faulty mcb or main switch in the installation with high resistance accross the device then the only test that will pick up this problem is a measured Zs.
     
  10. kung
    Offline

    kung Electrician's Arms

    measure sockets & calculate radials
     
  11. Graeme Harrold
    Offline

    Graeme Harrold Electrician's Arms

    Location:
    North Wales
    Always test, as its the final belt and braces check on a circuit. Takes seconds anyway.......:D
     
  12. WayneL
    Offline

    WayneL Guest

    And how would you do that?:)


    I vote for 'measure it' - especially if your only reason for not measuring it, is that you are too lazy to get out of your van and get your meter out :p
     
  13. johnboy6083
    Offline

    johnboy6083 Band Member Trusted Advisor

    Location:
    South east
    Ive got to admit, i didn't think about the loop test being the only one that tests the MCB (for resistance anyway). Thats a good point. I suppose that when youve done a lot of testing that you get to know what results to expect on a R1+R2, so that my earlier point about a Zs being misleading is null and void.

    Happy to be educated!
     
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