SWA supply to garage consumer unit

[Dambo]

When taking normal grey 2C+E from the main consumer unit - what's the name for the box where this cable is linked to the SWA which will be used for outdoors?

 

[kme]

Usually called "adaptable boxes"; such as the TLC LB9025

http://www.tlc-direct.co.uk/Products/LB9025.html

KME

 

[Dambo]

Usually called "adaptable boxes"; such as the TLC LB9025http://www.tlc-direct.co.uk/Products/LB9025.html

KME

Are these normally situated outside KME?

 

[m4tty]

Doesn't the twin and earth go through wall into back of adaptable box situated on wall outside ?

 

[Dambo]

Doesn't the twin and earth go through wall into back of adaptable box situated on wall outside ?

That's what I thought but I just wanted to make sure.

 

[kme]

Either way - doesn`t really matter, as long as the adaptable box used is suitable for its location.

If there is a cupboard available, for instance, I would generally fit the adaptable box inside, as I think the SWA run loooks better externally if the box cannot be seen.

NB If possible, the SWA can be terminated directly into the DB in the garage, with no need for an adaptable box (why have joints when you don`t need to?)

KME

 

[spinlondon]

If you strip back enough of the outer sheath and armour, you can make the gland off at the adaptable box and then make off the cores at the CU. Even passing the cores through walls if necessary.

 

[a1spark]

Back entry Galvo conduit end boxes are another option, with neoprene gasket under lid.

 

[Dambo]

On a slightly different tangent - When feeding a garage CU from the main house CU does the MCB in the main house CU have to be the same size as the RCD main switch in the garage CU?

 

[green-hornet]

On a slightly different tangent - When feeding a garage CU from the main house CU does the MCB in the main house CU have to be the same size as the RCD main switch in the garage CU?

No the mcb in the house should be chosen by design and calculation of the requirements or loading. The in comming main switch can be higher but not lower.

Your cable will be selected in the same principle.

 

[sparkytim]

The Rcd must be capable of carrying the current allowed to flow by the MCB in the main CU, i.e. if supply 32 A MCB then RCD must be

that, normally 40 A / 30 m A type suituable, but a 25 A / 30 m A woud NOT be.

This is basic stuff mate

.

 

[initforthemoney]

Basic isnt the word.

 

[m4tty]

Basic isnt the word.

And it's posts like that, that make people not want to post their queries. If you've got nothing useful to say then please don't post. Thanks ut the kettle on

 

[Dambo]

The Rcd must be capable of carrying the current allowed to flow by the MCB in the main CU, i.e. if supply 32 A MCB then RCD must be

that, normally 40 A / 30 m A type suituable, but a 25 A / 30 m A woud NOT be.This is basic stuff mate

.

If the RCD in the garage CU is capable of carrying more current than the MCB in the main CU that will leave the MCB in the main CU susceptible to tripping surely

 

[Dambo]

This whole 'these questions are basic' carry-on isn't needed. I'm the first to admit i've still got much to learn about the job and the industry. Just because I can put the NICEIC logo next to my name doesn't mean that all of a sudden i've got all the answers to all the questions. The reason I asked the above question about the main CU MCB and garage RCD is that if the MCB in the main CU is lower (even marginally) than the garage RCD then surely it's more susceptible to tripping if the garage CU is carrying full load. If that's a silly or 'basic' question then I apologise, but like I said in a post yesterday, i'd rather ask the question and get sneered at than try to blag it and get it wrong.

 

[AAAMUSEMENTS]

This whole 'these questions are basic' carry-on isn't needed. I'm the first to admit i've still got much to learn about the job and the industry. Just because I can put the NICEIC logo next to my name doesn't mean that all of a sudden i've got all the answers to all the questions. The reason I asked the above question about the main CU MCB and garage RCD is that if the MCB in the main CU is lower (even marginally) than the garage RCD then surely it's more susceptible to tripping if the garage CU is carrying full load. If that's a silly or 'basic' question then I apologise, but like I said in a post yesterday, i'd rather ask the question and get sneered at than try to blag it and get it wrong.

It might silence the critics if you could fill us in on your qualifications and experience...

as someone who is considering becoming qualified and registered myself, but finds the huge amount of knowledge required is both frightening and daunting, I would personally be very interesting to find out.

 

[Apache]

This whole 'these questions are basic' carry-on isn't needed. I'm the first to admit i've still got much to learn about the job and the industry. Just because I can put the NICEIC logo next to my name doesn't mean that all of a sudden i've got all the answers to all the questions.

Ask away, all questions are legitimate. Sometimes we all ask things and then realized we knew the answer all along . Just confirming what we think we know.

The reason I asked the above question about the main CU MCB and garage RCD is that if the MCB in the main CU is lower (even marginally) than the garage RCD then surely it's more susceptible to tripping if the garage CU is carrying full load. If that's a silly or 'basic' question then I apologise, but like I said in a post yesterday, i'd rather ask the question and get sneered at than try to blag it and get it wrong.

If the RCD in the garage CU is capable of carrying more current than the MCB in the main CU that will leave the MCB in the main CU susceptible to tripping surely

The MCB is overload protection, the RCD is earth leakage protection.

If you had a run out to a garage protected by a 20A MCB in the house consumer unit then [in simplistic terms] all that can be drawn down that cable is 20A. If you fit a garage consumer unit with a RCD rated @ 100A and a 16A breaker for sockets and a 6A breaker for lights it doesn't matter. You can't suddenly pull 22A (16+6) because the MCB in the house won't let you.

Make sense?

 

[sparkytim]

Well done that VET.

; \

 

[initforthemoney]

And it's posts like that, that make people not want to post their queries. If you've got nothing useful to say then please don't post. Thanks ut the kettle on

Im all for helping people out if they are stuck, however, these questions are very basic, plus the fact the NICEIC have passed him for registration!!!!! W T F?????

This trade just cant be learnt from the internet and forums such as this (as good as it is) and can only be learnt from experience.

Yes i would prefer someone ask rather than just guess and go for it.

This is the whole reason i am no longer directly involved with this industry.

We have got all these "electricians" attending courses, whatever ones they are, getting qualified and then working on peoples home "via the 'net".

All i can say is im glad i work on my own house and dont have to rely on the services of an electrician.

 

[kme]

Apache - Well done mate. Cracking answer. I`ll "scoob" you for that.