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Neutral Earth Loop Impedance Testing.

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Evenin' All,

                    I am watching a film so my brain is turned off. I have just bought a lovely old 70s Clare V144 loop tester. It can test L-E loops, N-E loops, L-N impedance and earth bonding or C.P.C. resistance at high currents.


What was the perceived wisdom in carrying out a N-E loop test of old please?


Z.

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    I would not use that instrument on a site - it is similar to the Evershed & Vignoles ones that I had (before I took them apart for the bits inside ?).and they would now be considered to be too dangerous to use.


    Mine would inject around 25A for about 30 seconds to do a Live - Earth loop test.  This would blow faulty connections apart and raise the potential on the metal parts of the installation to around 240 volts.  So potentially lethal to any occupants in the building. 


    Regards


    Geoff Blackwell


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  • 0
    I would not use that instrument on a site - it is similar to the Evershed & Vignoles ones that I had (before I took them apart for the bits inside ?).and they would now be considered to be too dangerous to use.


    Mine would inject around 25A for about 30 seconds to do a Live - Earth loop test.  This would blow faulty connections apart and raise the potential on the metal parts of the installation to around 240 volts.  So potentially lethal to any occupants in the building. 


    Regards


    Geoff Blackwell


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