Hi guys,
Whilst carrying out an ECR yesterday I was doing an r1r2 test on a lighting circuit (downlights) in a new extension and noticed that I was getting 15v L-N and 15v L-E with the circuit de-energised.
To cut a long story short after some investigation, I noticed that the 15v was coming from the existing main ground floor lighting circuit, which is on a completely different circuit (on a separate consumer unit). And the 15v only appears when the existing downlights s/l is energised.
The only time the 2 x separate circuits cross path to my knowledge is via the 3 x light switches via 3 cores, as the other set of downlight are on the other side of the RSJ. There are no neutrals in the switches, and even when I disconnected the main feed on the problematic circuit I'm still getting LN-LE voltage without them being connected.
Any ideas?
Whilst carrying out an ECR yesterday I was doing an r1r2 test on a lighting circuit (downlights) in a new extension and noticed that I was getting 15v L-N and 15v L-E with the circuit de-energised.
To cut a long story short after some investigation, I noticed that the 15v was coming from the existing main ground floor lighting circuit, which is on a completely different circuit (on a separate consumer unit). And the 15v only appears when the existing downlights s/l is energised.
The only time the 2 x separate circuits cross path to my knowledge is via the 3 x light switches via 3 cores, as the other set of downlight are on the other side of the RSJ. There are no neutrals in the switches, and even when I disconnected the main feed on the problematic circuit I'm still getting LN-LE voltage without them being connected.
Any ideas?