two way light switch, tripping rcd

[Mr Chibs]

Evening all

Around 6 months ago had a new consumer unit fitted (professionally).
Had made additions to the lighting circuit, with a few more LED downlighters (5w each) here and there.
Cable looks like 1.5mm.

Whilst carrying on with house refurb, I've been making do with a single light in a room, where I intend to have 5 or 6.

Upon leaving the house tonight, I went to switch a light on, (on a two way switch), and it tripped the RCD and killed all ground floor lights.
The switch controls 5 lights. Although I've been making do with 2 of the 5, yesterday I added a third... and everything was working.

Haven't had time to double check the '3rd' light wiring, but as it was working yesterday, I assumed it was correctly wired.

TIA

 

[ktuludays]

If it's been fine until you added the 3rd light I'd check there. Could be a loose connection. Are you sure a bulb hasn't blown, this would trip rcd as it popped.

Does the rcd reset with switch off?
If yes, does it trip when that circuit is turned back on?

 

[Taylortwocities]

Is it actually an RCD? does it have a test button?

 

[Mr Chibs]

Thanks guys

Got to the bottom of it, wierdly it was the crappy chocbox connector on light number one! It had munched the wire strands and not properly connected.

Yes, it was the RCD with test button... it's the first time I've encountered a modern consumer unit... should the MCB of tripped as well, or do they not do that?

 

[EFLImpudence]

Not necessarily. It depends on where the fault is, which or both trip.