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I would expect some inducted emf, but 110 seems and bit high and the lighting cables have a metallic sleeve to prevent this. I've never experienced more than 15v

Yes

The voltage is measured with a set of meggar test probes Type is TNCS Distance from origin is 5 and 39 metres a few board's No idea what current flow is, lighting circuit on 10a MCB Any earth removed from the various board shows a voltage between the disconnected earth cable for that...

Not really the point, it was noticed during testing. Can you contribute anything useful?

Hi I'm wondering if any one can help with a problem I'm having. We've installed a mccb panel which supplies 4 x 3 phase boards. The circuits test ok with regards to insulation resistance, but when I disconnect the earth from the earth terminal with the MCB on I can measure 110v between the...