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Did a kitchen refurb' a few weeks ago. One of the things the client wanted was under cabinet lighting. As the lighting circuit did not have an RCD, I powered the light from 2 x FCU's. The uc lighting was supplied by the kitchen manufacturer.
One FCU supplies 2 x led drivers (12v), with 2 x led lamps for each. This one is the one that's flashing, the other FCU set up is fine (3 lights with one driver).
Went there today for the first time to have a look, previously the client replaced the driver, for the set of lights that were flashing, which didn't rectify things. I disconnected the drivers/lights from the FCU cable, and recorded 12v across live & neutral on my tw&e from the FCU. Operated the FCU a few times and the voltage went. Thinking the switch was faulty, I replaced it. The voltage was no longer present, and no flashing. About an hour after I left the fault replicated again.
Again I found voltage across L&N, which only went after operating the FCU.
I've read here about induced voltages, snubbers etc, but could a faulty FCU switch be an issue? Can you add snubbers to 12v systems? FCU cable to lighting points run parallel with RFC, and one led cable from driver runs close to cooker supply cable. Done quite a few under cupboard LED sets, first time I've come across problem.
PS voltage only recorded with voltage tester. PPS flashing is very faint once every 5 mins, from only one of the first set of led lamps.
One FCU supplies 2 x led drivers (12v), with 2 x led lamps for each. This one is the one that's flashing, the other FCU set up is fine (3 lights with one driver).
Went there today for the first time to have a look, previously the client replaced the driver, for the set of lights that were flashing, which didn't rectify things. I disconnected the drivers/lights from the FCU cable, and recorded 12v across live & neutral on my tw&e from the FCU. Operated the FCU a few times and the voltage went. Thinking the switch was faulty, I replaced it. The voltage was no longer present, and no flashing. About an hour after I left the fault replicated again.
Again I found voltage across L&N, which only went after operating the FCU.
I've read here about induced voltages, snubbers etc, but could a faulty FCU switch be an issue? Can you add snubbers to 12v systems? FCU cable to lighting points run parallel with RFC, and one led cable from driver runs close to cooker supply cable. Done quite a few under cupboard LED sets, first time I've come across problem.
PS voltage only recorded with voltage tester. PPS flashing is very faint once every 5 mins, from only one of the first set of led lamps.
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