Garage c/u Tripping in House

[JoeBloggs]

Hi all looking for some advice working on a job adding on a couple of sockets and spurs for w/m.& heat / co alarm to existing c/u in garage which is getting supplied by 10mm t&e from house c/u on its own garage c/u 40a mcb anytime the washing machine gets used it is by passing 12way wylex c/u and tripping the garage c/u in the house all circiuts are testing fine iam lead to believe the 10mm T&E is undergroud in ducting everything is working fine until put some kingd of load on ie w/m kettles .any ideas would be much appreciated thanks.

 

[Strima]

What's tripping? MCB or RCD.

Could possibly be a loose neutral on the supply side but that's a pure guess.

 

[Pete999]

What's tripping? MCB or RCD.

Could possibly be a loose neutral on the supply side but that's a pure guess.

What he said

 

[UNG]

Hi all looking for some advice working on a job adding on a couple of sockets and spurs for w/m.& heat / co alarm to existing c/u in garage which is getting supplied by 10mm t&e from house c/u on its own garage c/u 40a mcb anytime the washing machine gets used it is by passing 12way wylex c/u and tripping the garage c/u in the house all circiuts are testing fine iam lead to believe the 10mm T&E is undergroud in ducting everything is working fine until put some kingd of load on ie w/m kettles .any ideas would be much appreciated thanks.

Can't make any sense of your post, might make more sense if you post a diagram of what you have

 

[Lucien Nunes]

until put some kingd of load on ie w/m kettles

This is the important bit. If heavy loads cause a trip, especially if the load is not on the RCD that trips, it suggests an N-E fault downstream of the RCD.

 

[DPG]

Are you saying there are RCDs in the garage AND the house? If so, then it's not that anything is 'bypassing ' anything, it's just that with 2 RCDs in series there is every chance that both will trip. Apologies if I've misunderstood.

 

[JoeBloggs]

This is the important bit. If heavy loads cause a trip, especially if the load is not on the RCD that trips, it suggests an N-E fault downstream of the RCD.

There is no RCDs on either board Just main switchs and Mcbs the house one is the only 1 that trips the 40amp mcb it by passes the 1 in the Garage cheers.

 

[James]

I think a picture of each board would help a lot here

Also how are you adding new sockets without an Rcd in place and making it complient?

 

[JoeBloggs]

I think a picture of each board would help a lot here

Also how are you adding new sockets without an Rcd in place and making it complient?

The Main switches are getting changed to Rcds the Garage 1 is a wylex 12w split board and the house 1 is Single main switch and 1 40mcb this is the orignal installation thats Tripping before i update it cheers.

 

[James]

Pictures?

MPS nobody is trying to trip you up here. It would truly be useful

 

[Lucien Nunes]

My bad for assuming an RCD was present! The cause of a 40A MCB tripping should not be too hard to find...

 

[DPG]

I assumed RCD tripping also. Didn't think it would be the 40A MCB.

 

[Vortigern]

I attended the exact same fault a couple of days ago. Two faulty sockets, replaced, fault disappeared. While it was ok with low draw things anything like a hair dryer of hoover tripped the MCB. Two different socket circuits doing the same thing. Cheapo sockets, arcing due to loose connections in the socket, pays to buy quality.

 

[Wilko]

working on a job adding on a couple of sockets

There is no RCDs on either board

Hi - hopefully there’s an RCD somewhere ?