Wiring to detached garage - is this right.

Depends wholly on the cable size and length of run, amongst other things. There is no "one answer fits all".

 

It depends on the size of the conductors in the SWA. What size are they? It is usually embossed on the outside of the cable.

Something like 3x2.5.

 

You would want 4mm upwards.

 

You are probably worrying over nothing; tell us the cable size and we'll tell you the recommended MCB size.
As above 32A on 2.5mm cable is NOT ok.

 

If it does turn out to be 2.5mm a 20 amp MCB would be the one to use provided that will be enough for the loads you will be using.

 

@The OP There is nothing wrong with the installation. Why do you assume there is? What you have described is a perfectly safe design and has no logic as to why you thought a 20A mcb should be used. I wish people would stop assumimng everything they see in an electrical installation is somehow wrong or should be something else. Ignore all the replies to your post and just leave it alone. For goodness sake.

 

A 20 amp breaker was only suggested if his cable turns out to be 2.5mm !

 

2.5mm2 SWA is rated at 28A. Why would an electrician use 2.5mm2 SWA? It is most likely 4mm2. If the CU it is feeding is broken down in to circuits with 16A and 6A mcbs then how can the cable possibly get overloaded? The 32A mcb on the front end is not a problem and I doubt the cable is 2.5mm2 SWA.

The OP stated "I've read elsewhere that that the mcb should be 20A". What on earth is he reading and why does he assume it is not correct? Do people question absolutely everything for no logical reason? That's all I am saying!

 

Because not all electricians are pro's like you. *

 

Morning all, I have not been in here for a while and I hate to see a couple of me mates arguing like this, you're both good sparks and couple of the best chaps in here that give good advice.

Come on me old muckers, lets try get on eh. .

Si

 

I have receieved a warning from Peter, one of the admin guys. In essence he has told me off for aggressive and innappropriate behaviour. I have requested him to enforce my request to get Lectrician off my back. His hypocrical behaviour towards me is the root of my aggression. He feels he is superior on this forum, answers everyones posts with cold advice and to my knowledge has never posted a question, ever, on this forum. That in itself should tell you that he thinks knows it all and doesnt ever need advice. So, one last time, ignore me you hypocrit. I know you are reading this, so just do it.

Hi Simon. Nice to see you.

 

Every comment in your last post reflect on you as well as me. Every point you have made against me apply to you too. You are arrogant, aggressive, and all your posts belittle other posters. Yet you can't see this. Just read back over your posts. You talk down to everyone, not just me.

 

I can from post #9 above why Unphased is getting people's back up, its commenting not just on the situation but suggesting what the OP is and should be thinking, that's second guessing and coming across as arrogant. I good lesson I learned from divorce counselling is express just what you think, use the "I" word and never the "YOU" word. "I think..." but don't suggest what the other person may think or how they might react - leave them to express that. Just express what you think.

So post #9 might sound like:

I don't see anything wrong with the installation. What you have described seems perfectly safe assuming the appropriate wiring has been used, and I have no reason to think it hasn't.

I'm sure Lectrician isn't without fault either, neither am I. Just using this as an example.

Morning all

 

...unless it's a 2.5 T&E running from the origin of a ring main.....which seems magically to be ok.....lol
RS

 

What about discrimination - I see no mention of this tbqh..

 

Don't start. We don't even know the SWA size yet. Let alone the CPD for them radials.

Mind you, the civil war above may have scared the OP away. Perhaps he is asking on Mumsnet.