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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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    Friday afternoon I had a conversation with a advisor in a test equipment manufacturers’ technical department, one of his comments was that I may need to adjust the test time of my no trip loop testers from 20 seconds to 10 seconds to stop Type A RCDs tripping when testing.


    The testing regime of the tester you have is the equivalent of hitting the circuit with an electrical sledgehammer, but then that’s what Hager is saying we should do with their 30 mA Type A RCDs If you don’t achieve the required X5 test results by hitting them with 250 mA.


    Trying  it on the rusty conduit will result in arcs flying with a crack and a bang.


    Andy
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  • 0
    Friday afternoon I had a conversation with a advisor in a test equipment manufacturers’ technical department, one of his comments was that I may need to adjust the test time of my no trip loop testers from 20 seconds to 10 seconds to stop Type A RCDs tripping when testing.


    The testing regime of the tester you have is the equivalent of hitting the circuit with an electrical sledgehammer, but then that’s what Hager is saying we should do with their 30 mA Type A RCDs If you don’t achieve the required X5 test results by hitting them with 250 mA.


    Trying  it on the rusty conduit will result in arcs flying with a crack and a bang.


    Andy
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