Garage unit trips house consumer unit problem

[porticoman]

I'm installing a garage unit but it's tripping the (20A) house breaker. There's no load on the garage unit so I'm missing something obvious/doing something stupid. The garage has pre existing T and E powering lights and a couple of sockets which I want to modify to get a bit of practice after doing Part P. The Wylex 2 way unit (1 x 6A and 1 x 16A) and a RCD is connected as per the instructions (yes,I've read them!) Line/Neutral into the RCD, CPC into the Earth bar and the pre installed neutral link is in place. I've checked the connections to they are biting the conductor not insulation, tight etc. When it's returned back to its original format (no garage unit) it works perfectly so I'm being dense and maybe not asking the right question. Anything constructive suggestions the forum could add would be great.

Thanks

Peter

 

[growler]

call an electrician in mate.

 

[SparkyDips]

is it an armoured cable going to the 2 way board from the house?

 

[Specialist]

Might seem obvious, but when you put the L/N into the RCD did you make sure they were the right way Round ? You could try just fitting the 2 way in the Garage with no Circuits connected & see what happens.

 

[Richard]

I'm installing a garage unit but it's tripping the (20A) house breaker.

Hi, I read that to mean it's tripping the MCB, is that correct?

Is it tripping, even with the RCD switched off in the garage? Have you tested the submain, and did the results seem satisfactory? What is the earthing arrangment out of interest? Can you check the cable feeding the garage physically for damage?

Rich

 

[flukey]

call an electrician in mate.

here we go again :goofy:

 

[porticoman]

Bimey, that didn't take long. Yes it's SWA. There's nothing connected to the unit at the moment, I did try it with a radial final attached, but it tripped. I disconnected it to see if it was part of the original installation or something I'd done wrong. Sadly it was the latter of the two! It's currently restored to its original state (without garage unit) and is working fine.

 

[Octopus]

What test equipment do you have at your disposal?

 

[Specialist]

OK so what was the problem ? or have'nt you worked it out yet ?

 

[jase]

original state( without garage unit) so you just have a SWA from the 20A in the house going to nothing???:confused5:

 

[Dunx]

What is tripping the mcb or the RCD? Whichever you need to test the sub main the garage from the house end, with L&N disconnected. Test for polarity and IR. If that tests ok then come back to us!

 

[Specialist]

original state( without garage unit) so you just have a SWA from the 20A in the house going to nothing???:confused5:

From the way I read it he's re-connected the orignal light & sockets to the way they were.

 

[micknew]

Priceless advice Growler.

 

[Octopus]

This is a perfect example of why an electrician connects up a new or modified installation, they conduct a set of "dead" tests to establish all is as it should be, before going live.

 

[SparkyDips]

has the steel wire armour been connected to the earth terminal at both ends??