Evening all,
Visited a customer yesterday who said their lamps were blowing regularly in the living room light fitting. I took the light fitting down and visually it looks fine. Its a metal fitting with 3 arms with an SES lamp holder on each. I removed the lamps and insulation tested the fitting with 999+Mohms as the result. All good. I then turned my attention to the wiring. R1 R2 from the light point to the board was 0.62. Insulation res for the circuit was 999+Mohms L-N, L-E, N-E, (lamps removed). Zs from the light was 0.88. Supply polarity is fine and the Ze is 0.22.
However there is a voltage of 58V showing from the SW line to earth when the switch is turned off.
The feed has been taken to the light point in t&e and a 3core cable has been taken to the switch. This is a permanent live, neutral and SW line back to the light. A live and neutral is needed at the switch due to a t&e leaving it to feed the kitchen light switch. I disconnected the 3 core either end and insulation res tested it. Again 999+Mohms was the result. When the permanent live is connected at the light point the SW line in the cable becomes live at 58V even though is completely disconnected each end.
I am returning tomorrow to have another look.
Any input would be helpful.
Regards
James
Visited a customer yesterday who said their lamps were blowing regularly in the living room light fitting. I took the light fitting down and visually it looks fine. Its a metal fitting with 3 arms with an SES lamp holder on each. I removed the lamps and insulation tested the fitting with 999+Mohms as the result. All good. I then turned my attention to the wiring. R1 R2 from the light point to the board was 0.62. Insulation res for the circuit was 999+Mohms L-N, L-E, N-E, (lamps removed). Zs from the light was 0.88. Supply polarity is fine and the Ze is 0.22.
However there is a voltage of 58V showing from the SW line to earth when the switch is turned off.
The feed has been taken to the light point in t&e and a 3core cable has been taken to the switch. This is a permanent live, neutral and SW line back to the light. A live and neutral is needed at the switch due to a t&e leaving it to feed the kitchen light switch. I disconnected the 3 core either end and insulation res tested it. Again 999+Mohms was the result. When the permanent live is connected at the light point the SW line in the cable becomes live at 58V even though is completely disconnected each end.
I am returning tomorrow to have another look.
Any input would be helpful.
Regards
James