Discuss Erroneous test during pre testing in the Electrical Forum area at ElectriciansForums.net

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Hi,
While doing the Erroneous test during my pre test I came across abit of a headache.
When I was doing a lighting circuit it was coming in a short eg. 0.04ohms but once I disconnected an LED light in a bathroom it went away, same with socket circuits which had USB sockets connected on them, is this normal or am I getting something wrong ?? Everything else is fine rp+re and IR test between you phase&neutral to earth.
I had all mcbs up in the on position except the circuit i was testing and went from the phase busbar to the top of the mcb I had switched off.
Thanks
 

timhoward

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For those wondering, as I myself was a minute ago, I think this is an extra test required in Irish regs to detect inter-connections between circuits.
I believe it's a (dead!) test between the busbar with all but one MCB on, and the outgoing side of MCB.

Not having ever done this myself, I'm still working out how this works as there will be resistances through any connected loads back to the N bar, back through other loads to the other MCB and the bus bar. So I'm wondering if you are supposed to have N's disconnected for this test?
Please can a RECI put us out of misery!
 

timhoward

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Ah - to answer my own question:
4/15 - Test 6 - Erroneous connections
The following test shall be carried out in order to detect erroneous connections between circuits: For each circuit, its protective device shall be switched off and an insulation test in accordance with Table 61A applied between phase conductors of that particular circuit and all other phase conductors.
Note 1: This is an additional test to those specified in CENELEC HD 384.6.61:1992 Note 2: All loads in the circuit under test must be disconnected e.g. appliances switched off, lamps removed.
 
OP
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There's your answer - no loads at all, including USB sockets.
Thanks very much Tim,
For those wondering, as I myself was a minute ago, I think this is an extra test required in Irish regs to detect inter-connections between circuits.
I believe it's a (dead!) test between the busbar with all but one MCB on, and the outgoing side of MCB.

Not having ever done this myself, I'm still working out how this works as there will be resistances through any connected loads back to the N bar, back through other loads to the other MCB and the bus bar. So I'm wondering if you are supposed to have N's disconnected for this test?
Please can a RECI put us out of misery!
Thanks very much Tim for the info great to find out abit more from someone with more experience ?
 

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