60V on light (pendant) with light switch off.

[matt_bei]

Have been called to a recently installed installation. Customer noticed one of the GLS BC LED lamps was glowing when turned off. Here are the facts:

• Circuit tested - all tests appear normal.
• Wired with feeds at the switch.
• All lamps are LED

• Measured voltage when lights switched on is normal.
• With lights switched off, measured voltage across L-N and L-CPC is approx 60V (ONLY ON LIGHTS SWITCHED BY A 2 or 3 WAY)
• When 3-core (2 way) is disconnected from circuit, 60V reading disappears.
• Insulation resistance of 3 core cable is >500Mohms
• Everything is brand new

Please help.
Is this normal? Where is the 60V coming from? Is it somthing to do with the switch/2 way configuration?

Many thanks

 

[Brightspark2]

Induced voltage...what cores are used for what on the 2 way?...

Youll need to fit a snubber, have a search squire...loads if threads on this...

 

[bigbaddave]

Induced voltage as above bud.. It a knightmare the first time you have it aint it bud..

 

[Stroppy]

Tickles, as well.

 

[sedgy34]

Inductance
You need to fit a capacitor swl &N at the switch

 

[GT1]

Yes had similar before. It may be 60v but there's no wellie behind it..! lol

 

[Octopus]

Inductance
You need to fit a capacitor swl &N at the switch

What happens if the N isn't at the switch!

 

[sedgy34]

What happens if the N isn't at the switch!

from the pendant,jb then

 

[Stroppy]

Are these snubbers commercially available, or do you just grab any old capacitor out of the back of a telly and add it between the appropriate terminals?

 

[Silly Sausage]

Contact Suppressor : Suppression : Maplin Electronics

 

[gooner85]

Rs components do them, have to buy in pack of 5. Worth having in the van though