- #1
krislaine
- 1
- 0
I was carrying out a insulation resistance test on a ring main circuit at the dist board in an industrial workshop. The majority of the wiring is single core pvc cables run in metallic trunking and conduit. The majority of circuits have no cpc as the trunking/conduit is being used. When I disconnect the 2 phase and 2 neutral conductors I measure approx 50v to Earth on these conductors. This voltage reduces to around 6v when I turn off the mcb feeding a fluorescent lighting circuit (9 x twin 1500mm). Is the lighting circuit inducing a voltage on the ring circuit? Is this a problem and if so how do I overcome it?
The installation is approx 30 years old with numerous alterations and additions
Many Thanks
The installation is approx 30 years old with numerous alterations and additions
Many Thanks