Adding electricity to a garage from a main consumer unit in the house

[Polyjeff]

Hello

Im looking at adding electricity to my garage. The armoured cable is already in place but its just connected to a 16amp Circuit breaker in the house CU and then just a plug socket in the the garage.

I understand thats not right so I was planning

1. Placing a 2 gang CU with 40A 30mA RCD in the garage with a 20 or 25amp MCB for the 1 double socket
2. A 6amp MCB for the 1 light

I was going to put this into a 32 amp MCB in the consumer unit in the house where the feed is coming from.

The question is would this be ok or should I be using a smaller MCB in the house CU and the Garage consumer uint. I didn't want to put a 32 amp in the garage as the socket will be a radial circuit and not a ring and as its only going to be powering a tumble dryer I didn't want to add a 32amp mcb as this seems to High and would never trip if a fault was found on this kind of circuit.

My other option would be

taking a feed from the house consumer unit via a 16, 20 or 25 amp MCB via the armoured cable to the garage then into a metal socket that has an RCD and then from the socket to a fused spur to power a light. That way missing out the need for a CU in the garage.

Please can you give me your options, I really need help with what size MCB's need to be used in the house and garage.

Thanks for you help

 

[goasis]

I think your understanding of MCB's, fault protection & circuit design may be a little flawed.
Classic answer, but you really need to employ the services of an electrician if you want this done correctly, safely, and legally.

Having said that, you state that your current set up is "not right" but depending on a number of factors you haven't mentioned (cable size, requirement for rcd protection etc) it may actually be perfectly acceptable.

 

[Octopus]

Do you know the size and length of the existing swa cable?

And more to the point what is wrong with the existing set up? Sounds very standard imho

 

[Simonslimline]

A little bit of knowledge is dangerous!

Get an electrician.

 

[telectrix]

to add.the rating of the MCB in the house will be totally dependent on the size and installation method of the SWA feeding the garage. e.g. if it's only 2.5mm, then you're limited to 16A or 20A. ( caveat... also depends on the length of the run and whether or not your efli is compliant with the selection of MCB, and whether or not you have extraneous services in the garage).

 

[Polyjeff]

The existing swa cable is 6mm and runs 15 meters

 

[Andy78]

The existing swa cable is 6mm and runs 15 meters

This information should help you calculate and plan your proposed alterations in accordance with the wiring regs.
If your capabilities don't extend to this, you should contact a local electrician.

 

[buzzlightyear]

taking a feed from the house consumer unit via a 16, 20 or 25 amp MCB

polycell, its not play cards write .has above. agree with my fellow sparks .

 

[buzzlightyear]

Are you dyslexic Buzz by any chance

you mean polycell ,joke .

 

[buzzlightyear]

Are you dyslexic Buzz by any chance

some times.

 

[buzzlightyear]

MASSIVE 1 ,could you change your avatar for this .LOL .

 

[JAWS]

some times.

Nah the only reason I ask mate is my daughter writes basically the same as you and she is dyslexic.

 

[Octopus]

The existing swa cable is 6mm and runs 15 meters

Are you 100% sure about that - I'd be very surprised.

 

[GeorgeCooke]

Hello

Im looking at adding electricity to my garage. The armoured cable is already in place but its just connected to a 16amp Circuit breaker in the house CU and then just a plug socket in the the garage.

I understand thats not right

Looks perfectly OK to me. Is there an RCD in the house CU? If the answer is yes you don't need or want another in the garage.

For a light in the garage spur off the socket to a switched fuse spur unit with a 5 amp fuse.

 

[Octopus]

Looks perfectly OK to me. Is there an RCD in the house CU? If the answer is yes you don't need or want another in the garage.

For a light in the garage spur off the socket to a switched fuse spur unit with a 5 amp fuse.

I don't think the OP is a spark judging by their input ........ so dishing out "advice" like this isn't ideal..............