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Rather than have a line of plugs in a 3-gang extension on top of my kitchen cabinets, I thought that if I split the feed, then fuse and switch each power supply for each LED strip, it would be an ideal solution.

One feed to a 240 V AC to DC converter for a LED strip, one feed to a 24 V LED driver, and the other to a 12 V adaptor.

However, when I turn the switches off, the 240 V LED strip is still very dimly lit. I’ve checked the voltage for each feed and I’m getting 48 – 50 VAC on all three.

Schematic

Can anyone suggest a solution to this, please?

Hi , Thanks for all your replies. I've just rigged up a test harness and found that it is an induced voltage. I'm running a 2 core wire from the fuse box down to a 3 gang switch & then back to the adapters. When I replicate the length I'm getting 48 VAC . Seems a bit weird to get that kind of voltage but I can re-route everything to get round it. jsotola - the 240v LED is from the AC DC adapter (apologies for missing that out)

Billywiz
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    there is no 240 V LED strip in the diagram – jsotola Sep 27 '22 at 16:12
  • what happens if you separate all of the circuits? – jsotola Sep 27 '22 at 16:13
  • If you are getting 48-50V on each, then you are not connecting per the diagram. Or your "fuses" are not fuses. – Eugene Sh. Sep 27 '22 at 16:36
  • It could be a slight induced voltage from nearby wiring, particularly since the neutral is shared. You might consider using a double-pole switch to also disconnect the neutral, and keep the neutral and live for the LED strip away from the other wires. 48-50 volts is very high for induced voltage though. – user253751 Sep 27 '22 at 16:58
  • When you run neutral and live separately, the amount of magnetic field created is proportional to the area in between them. – user253751 Sep 27 '22 at 16:59
  • This is likely capacitive coupling. https://electronics.stackexchange.com/a/567766/166672 – Aaron Sep 27 '22 at 20:34
  • Suggestions:1. Try placing a 100k to 1M resistor across the input to each power supply . 2. Use 2PST to switch both feed lines to each power supply. – RussellH Sep 28 '22 at 02:08

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