Ring feeds 5A FCU
FCU -> Junction Box -> Switch / Feed to Transformer
Transformer feeds 4 downlights
Need to replace Transformer to have four lights off 240V
Put in new 1mm T&E from JB to feed four lights
Just got the cable to the last light and cut it and the RCD trips
Before my cabling, I Isolated the JB by removing the 5A fuse from the FCU -> checked voltage before and after at the JB. 240V before switch and 216V after switch (dimmer). With 5A fuse removed, no pd.
Am I going mad - no-one else touched anything, and the instantaneous trip at precisley the time I cut the cable implies the cable was live?
FCU -> Junction Box -> Switch / Feed to Transformer
Transformer feeds 4 downlights
Need to replace Transformer to have four lights off 240V
Put in new 1mm T&E from JB to feed four lights
Just got the cable to the last light and cut it and the RCD trips
Before my cabling, I Isolated the JB by removing the 5A fuse from the FCU -> checked voltage before and after at the JB. 240V before switch and 216V after switch (dimmer). With 5A fuse removed, no pd.
Am I going mad - no-one else touched anything, and the instantaneous trip at precisley the time I cut the cable implies the cable was live?