LED Lights tripping issue

[New lamps for old]

4 outside LED bulkheads trip Mcb however when connected via an extension plugged into the ring they work fine. IRs fine Mcb rating and curve correct. In rush current negligible length to 1st light 5 metres overall length of the circuit 10 metres. What's wrong?

 

[James]

What breaker is in use?
is it a dedicated circuit or part of the lighting circuit?

 

[New lamps for old]

What breaker is in use?
is it a dedicated circuit or part of the lighting circuit?

Wylex NHX 6A dedicated

 

[telectrix]

inrush. upgrade MCB to a type C. even maybe a 10A.

 

[New lamps for old]

inrush. upgrade MCB to a type C. even maybe a 10A.

Thanks good answer however already tried that it didn't work. Interestingly manufacturers techie tells me he has 6 in his garden no issues?

 

[pc1966]

What rating of lights are they?

Can you put any other load (e.g. single light) on the same connections that you are trying to use?

That part is a Wylex RCBO so a "borrowed neutral" or someone having swapped N & E would cause it to trip.

 

[DPG]

Good spot on it being an RCBO. Puts a different perspective on things.

 

[New lamps for old]

Good spot on it being an RCBO. Puts a different perspective on things.

Sorry to disappoint but it is defo an Mcb. I have tried putting another lighting load on this Mcb (swapped from an existing circuit) and it works fine. Thanks for anyone trying to sort this it really is helpful.

 

[pc1966]

Sorry to disappoint but it is defo an Mcb. I have tried putting another lighting load on this Mcb (swapped from an existing circuit) and it works fine. Thanks for anyone trying to sort this it really is helpful.

What is the total load?

Typically a 6A B MCB should be good to 300W or so simultaneously switched.

How is it controlled? Is it an arc-y switch, if so have you tried a new switch?

If it is a relay then a zero-crossing SSR would greatly reduce inrush, but obviously cannot be used for safe isolation.

 

[DefyG]

however when connected via an extension plugged into the ring they work fine.

Does the mcb activate instantaneously or after a few seconds?
Where did you connected the extension lead into the circuit? Its possible if disconnecting at the fittings you have eliminated a faulty cable supplying them!
Did you do L-N when doing IR test and not just L-E?
Its possible that through the extension lead plugged in to socket on 32A mcb on RFC and 13A 1362 in plug top that it wont trip.
Is the circuit not protected by RCD?

 

[New lamps for old]

Hello DefyG,

Mcb trips instantly, connected the extension on the lighting tails in the CU so proving the supply cable to the 1st light, IRs taken with the lights disconnected at each connection local box L/N L/e N/e 200+Meg, Individual lights checked on a flying lead and with all 4 connected, the circuit is on a split board each half RCD Protected. Other things tried - re routed the outgoing supply cable away from the intelligent meter, and longer supply lead to 1st light also tried the supply from the alterative side of the CU.

 

[James]

Take the plug off the extension lead and wire it to the original breaker.

 

[pc1966]

You also seem to be ignoring the question about total load?