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Errroneous Earthing.

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In the past I have found a metal outside bulkhead light earthed by a wire connected to a steel screw and washer that was just screwed into the brick wall below the light.

Yesterday I came upon a 50s/early 60s installation with no earthing at lighting points. Some brass plated light switches had been added by the previous owner. A sticker on the back of the brass switches said that they must be earthed, so the installed had amateurishly connected a wire from the brass plates to the central back box securing screw. The metal back boxes were unearthed though.

Z.

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    I have seen quite commonly two way switching installed in a combination of T&E and PVc/PVC singles where the T&E cpc is left floating because it's fed by a single without CPC and supplies a single without cpc.  Generally installed by ‘electricians’  and often with brass switches.  It all looks fine visually at the switches until you test it or measure the voltage on switch plate to a proper earth with a modern high impedance instrument.  I suspect these guys were on auto pilot and the lower scope of testing in those days didn't pick up the problems.

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    I have seen quite commonly two way switching installed in a combination of T&E and PVc/PVC singles where the T&E cpc is left floating because it's fed by a single without CPC and supplies a single without cpc.  Generally installed by ‘electricians’  and often with brass switches.  It all looks fine visually at the switches until you test it or measure the voltage on switch plate to a proper earth with a modern high impedance instrument.  I suspect these guys were on auto pilot and the lower scope of testing in those days didn't pick up the problems.

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