N
Noob2013
Hi all,
I have a strange lighting fault which I'm trying to get my head round. I popped in to a family members house on the way home from work so didn't have a Meggar. However, i had a multimeter and also carried out an inspection and test on this property a couple of months ago and found no problems.
The fault is on the kitchen/dining lights. There is 4 x GU10 3 spot fittings (fitted with the LED GU10s) There is a 2g switch, each switch supplying 2 lights.There are 2 t&e's at the switch (perminent and switch for each set).
Whenever either switch in the kicthen was switched on the mcb trips.
On arrival, several led lamps had physically burnt out and in a right state! Removed all lamps and still tripping!
Disconnected one light from each set and mcb did not trip! Faulty fittings came to mind but 2 at same time seemed odd!
Replaced the lamps in the 2 fittings still connected and the lights came on. After several minutes they tripped so I thought maybe the cheap led GU10s were the cause.
I used my multimeter for supply at the lights instead. The problem I found was that either switch seemed to give a supply all 4 lights even though the switch wires cannot be connected as they are on separate twin and earth's from switch. I can't get my head around it!
Did a bit of testing with my multimeter and all the cables at each light appear to be in the correct terminals. I also testing it a few months ago and found no dead shorts or issues.
With the mcb off, I switched each switch individually and made sure that it was switching the 2 lights it should and not the other 2.iSo dead testing of the switches seemed like there was no interconnection between them and was switching correctly. But when circuit energised all the switch lives had voltage!
One thing I noticed when mcb off, I had 0.8v DC between the 2 switch lives at switch??
The only thing I didn't try was to physically disconnect the other 2 fittings, possibly faulty too?? back feed on neutral???
I am going back with my Meggar to test everything properly but I have recently done this and everything was fine. Just seems odd that the leds were burnt out and 2 fittings were causing the mcb to trip with no lamps in. Any ideas before I return would be much appreciated as I got to the point were I was thinking WTF!
All I can think is the other 2 fittings are faulty too and giving a back feed through the neutral but again doesn't sound possible with lamps removed and there are no electronic parts (only lamp holders)
Thanks
I have a strange lighting fault which I'm trying to get my head round. I popped in to a family members house on the way home from work so didn't have a Meggar. However, i had a multimeter and also carried out an inspection and test on this property a couple of months ago and found no problems.
The fault is on the kitchen/dining lights. There is 4 x GU10 3 spot fittings (fitted with the LED GU10s) There is a 2g switch, each switch supplying 2 lights.There are 2 t&e's at the switch (perminent and switch for each set).
Whenever either switch in the kicthen was switched on the mcb trips.
On arrival, several led lamps had physically burnt out and in a right state! Removed all lamps and still tripping!
Disconnected one light from each set and mcb did not trip! Faulty fittings came to mind but 2 at same time seemed odd!
Replaced the lamps in the 2 fittings still connected and the lights came on. After several minutes they tripped so I thought maybe the cheap led GU10s were the cause.
I used my multimeter for supply at the lights instead. The problem I found was that either switch seemed to give a supply all 4 lights even though the switch wires cannot be connected as they are on separate twin and earth's from switch. I can't get my head around it!
Did a bit of testing with my multimeter and all the cables at each light appear to be in the correct terminals. I also testing it a few months ago and found no dead shorts or issues.
With the mcb off, I switched each switch individually and made sure that it was switching the 2 lights it should and not the other 2.iSo dead testing of the switches seemed like there was no interconnection between them and was switching correctly. But when circuit energised all the switch lives had voltage!
One thing I noticed when mcb off, I had 0.8v DC between the 2 switch lives at switch??
The only thing I didn't try was to physically disconnect the other 2 fittings, possibly faulty too?? back feed on neutral???
I am going back with my Meggar to test everything properly but I have recently done this and everything was fine. Just seems odd that the leds were burnt out and 2 fittings were causing the mcb to trip with no lamps in. Any ideas before I return would be much appreciated as I got to the point were I was thinking WTF!
All I can think is the other 2 fittings are faulty too and giving a back feed through the neutral but again doesn't sound possible with lamps removed and there are no electronic parts (only lamp holders)
Thanks
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