I am in a 5-year-old property, so all circuits are new. There are 4 x 240V 7W downlights in the bedroom. I decided to install a bedroom ceiling spotlight by means of a piggyback off one of the downlights.
In preparation for installation, I switched off at the wall switch and the annotated bedroom lighting circuit in the consumer unit. Before making the wire connection to the existing downlight I took the further precaution of running a Schneider voltage detector over the loop in and out lighting circuit. To my surprise, the S.V.D. lit up.
I then switched off all the lighting circuits in the C.U. but the bedroom downlight wire was still showing live on the S.V.D. It was only when I then switched off the 13 amp socket circuit in the bedroom that the lighting circuit went truly dead, as indicated by the V.D.
This has got me puzzled. What is the explanation? If this is a problem, how do I check it out.
Thanks
In preparation for installation, I switched off at the wall switch and the annotated bedroom lighting circuit in the consumer unit. Before making the wire connection to the existing downlight I took the further precaution of running a Schneider voltage detector over the loop in and out lighting circuit. To my surprise, the S.V.D. lit up.
I then switched off all the lighting circuits in the C.U. but the bedroom downlight wire was still showing live on the S.V.D. It was only when I then switched off the 13 amp socket circuit in the bedroom that the lighting circuit went truly dead, as indicated by the V.D.
This has got me puzzled. What is the explanation? If this is a problem, how do I check it out.
Thanks