Capacitive effect of switch wires. Any cure?

[ericmark]

I know it's the capacitive link between the switch wires which causes my LED bulbs to glow and I remember doing the impedance of feeders in University but other than putting a tungsten bulb in parallel can't think of how to alter things to stop the LED's glowing.

I wonder if I can fit a choke some where to stop it? Sure not only one to have this problem so I would guess there is somewhere an easy cure?

The four lamps with a problem have two way switching and intermediate so double pole switches is not really an option.

The ceiling lamp could relay but two wall lamps no chance. As yet not measured the voltage. Would guess very low but more for interest than anything else any way to use a choke to correct?

 

[DaftPunk]

Assuming you've checked all the CPC's are actually earthed then you could try this.

I've cured it before on a circuit with CFL's by wiring a neon robbed out of a 20A DP switch in parallel with the load. It's enough of a load to drian the capacitive coupling, but will not make any difference to the overall load or normal operation of the circuit. I think this would work with LED's too.

 

[Scoby_Beasley]

Snubber Time!!!

Try sticking on of these across the last light on the circuit. (I take it you mean the LEDs are glowing after being switched off?).

 

[ericmark]

I am going to leave as it is for a week as the dim light may be an advantage as room light now changes less when cars drive by so cars do not wake me like they did.

However out of interest I will still do some tests. I am sure when I fitted them I did test the loop impedance but it's a long time ago.

 

[Adam_151]

I have in the past fitted a 100 nF X2 rated capacititor across lamp live and neutral to cure a very similar problem. (badly designed 28W 2D fitting with em inverter used the switch line as a signa to turn on with the result that with a 2 way switching arrangement, it would not turn off )