12V Shower Lights

[westec]

My bathroom was fitted with 3 - 12v 35w shower lights about 2 years ago. One of the lights has started to flicker/dim/extinguish. If I switch off & on again it works fine for about 1 minute & then flickers etc. Have changed the bulb for a new one & changed it with one of the other working bulbs but the same happens on the same light. This must rule out a faulty bulb. The 3 lights are all connected to one transformer, rated 105VA, does this rule out the transformer. The wiring from the transformer goes to a good light, then the faulty light then a good light. I notice that none of the fittings are earthed, even though twin & earth wiring, the earths being connected together but not connected to the fitting. Can someone help?

 

[sparkyspike]

Have you tried replacing the bulb holder (the part which the bulb plugs into and its cable)?

Also, I don't think the ELV cable should daisy chain from one fitting to another. You should have a cable running from the tranny to each fitting. Does the tranny have 3 seperate outputs?

SELV wiring has no earth. Twin and earth cable has been used instead of two-core cable, so the CPC (earth cable) is not needed.

 

[ericmark]

It is a common fault that the connectors on small 12 volt spot lights get a bad connection and overheat as soon as that happens the little socket needs changing.

 

[westec]

Will replace the bulb holder (when I can find one) Thanks for your help.

 

[RF Lighting]

Click on the pic

 

[westec]

Ericmark got it spot on. Went to change the holder & found that a screw in the holder was loose. Nice to get a simple solution to a problem
Thanks everyone
Jon