Wiring up garage lighting

Joe · Sep 17, 2018

Hi I'm new to this forum but am hoping for some advice on wiring for my garage.

Ive recently built a new garage at the bottom of the garden and have run 30m of 6mm swa from the house to a new consumer unit in the garage to power 2 florescent lights from a 6a MCB, a 13a socket from a 16a MCB and a 16a socket from a 20a MCB. Everything is correctly terminated and works properly.
However, I'd now like to add a switch to the lighting circuit rather than using the consumer unit to switch on and off. I have bought a 1 way outdoor switch for this circuit but believe I will need to add a ceiling rose/ junction box to avoid a short circuit. Please can someone look at my wiring diagram to let me know if they think it works. Is this the simplest option? Also would wiring like this pass regulations; I'm doing the work but will need this signed off by a spark when I'm finished.
Many thanks in advance.
Joe

[ElectriciansForums.net] Wiring up garage lighting

telectrix · Sep 18, 2018

that willl work, but you need to get your tame electrician to test before energising.do not power up before he's done the dead testing.

Strima · Sep 18, 2018

Why a 20 amp MCB for a 16 amp socket?

ChrisElectrical88 · Sep 18, 2018

Is anything 30mA RCD protected?

Strima · Sep 18, 2018

I wouldn't bother with roses, just feed direct through the switch.

Spoon · Sep 18, 2018

Joe said:
I have bought a 1 way outdoor switch for this circuit

Out of curiosity, why an outdoor switch? Why not just put a switch inside the garage?
Are there any extraneous conductive parts in your garage?
Also, as above, any RCD protection?

TJ Anderson · Sep 18, 2018

Joe said:
Hi I'm new to this forum but am hoping for some advice on wiring for my garage.

Ive recently built a new garage at the bottom of the garden and have run 30m of 6mm swa from the house to a new consumer unit in the garage to power 2 florescent lights from a 6a MCB, a 13a socket from a 16a MCB and a 16a socket from a 20a MCB. Everything is correctly terminated and works properly.
However, I'd now like to add a switch to the lighting circuit rather than using the consumer unit to switch on and off. I have bought a 1 way outdoor switch for this circuit but believe I will need to add a ceiling rose/ junction box to avoid a short circuit. Please can someone look at my wiring diagram to let me know if they think it works. Is this the simplest option? Also would wiring like this pass regulations; I'm doing the work but will need this signed off by a spark when I'm finished.
Many thanks in advance.
Joe

View attachment 44350

Hi Joe

If it's already wired and the switch is an addition, you could just wire your new switch back to the CU and do your connection in there.

Pete999 · Sep 18, 2018

TJ Anderson said:
Hi Joe

If it's already wired and the switch is an addition, you could just wire your new switch back to the CU and do your connection in there.

Failing any of the above you could get an Electrician to do the job properly, supply all the relevant certification etc.

TJ Anderson · Sep 18, 2018

I dont think anyone who asks q's on here wants an electrician or certification.

Pete999 · Sep 18, 2018

TJ Anderson said:
I dont think anyone who asks q's on here wants an electrician or certification.

If that is the case why is everyone offering advice when we all know what is required certificate wise, and the rule of the Forum regarding offering advice to What appears to be a DIY job. Should got the job done by a professional in the first place, of course if the OP says he is an Electrician, then he should give up, or get a new career.

TJ Anderson · Sep 18, 2018

He is saying he wants a spark to sign it off at the end. He can use the Part P 3rd party sign off for that. Spark can inspect and test it and charge handsomely for it. If anything is amiss they can charge redo it or OP can redo it himself and the spark can charge again to inspect and test again until they are happy. 3rd party sign off is not cheap.

Pete999 · Sep 18, 2018

TJ Anderson said:
He is saying he wants a spark to sign it off at the end. He can use the Part P 3rd party sign off for that. Someone can inspect and test it and charge handsomely for it. If anything is amiss they can charge redo it or OP can redo it himself and the spark can charge again to inspect and test again until they are happy. 3rd party sign off is not cheap.

Like I said TJ should have got the job done right in the first place. People froging about with electrics when they don't know what they are doing is a recipe for danger and unnecessary expense.

TJ Anderson · Sep 18, 2018

Pete999 said:
Like I said TJ should have got the job done right in the first place. People froging about with electrics when they don't know what they are doing is a recipe for danger and unnecessary expense.

He's an adult and that's his decision what he chooses to do. The job may well be satisfactory. The spark who tests and inspects it will decide that.

ipf · Sep 18, 2018

Pete999 said:
Like I said TJ should have got the job done right in the first place. People froging about with electrics when they don't know what they are doing is a recipe for danger and unnecessary expense.

…..and SWA and DIY don't tend to go together too well.…….about as well as frogs with electrics.

TJ Anderson · Sep 18, 2018

I know what you're saying, but he only asked about a light switch lol. Why do we have to consider his whole install and certification? Someone is gonna ask about him "exporting" something in a minute hahaha

Pete999 · Sep 18, 2018

TJ Anderson said:
I know what you're saying, but he only asked about a light switch lol. Why do we have to consider his whole install and certification? Someone is gonna ask about him "exporting" something in a minute hahaha

TJ, the OP did the entire install

Pete999 · Sep 18, 2018

TJ Anderson said:
I know what you're saying, but he only asked about a light switch lol. Why do we have to consider his whole install and certification? Someone is gonna ask about him "exporting" something in a minute hahaha

TJ, the OP did the entire install

Octopus · Sep 18, 2018

Part P, inspection and testing?

Insurance not paying out ..............................

Could be a very expensive "saving" the OP is trying to make.

Pete999 · Sep 18, 2018

TJ Anderson said:
He's an adult and that's his decision what he chooses to do. The job may well be satisfactory. The spark who tests and inspects it will decide that.

If some one will take the test and inspect on, if the OP is taking that tack the the Person that's going to do the testing should have been involved from the outset of the job.

Toneyz · Sep 18, 2018

Pete999 said:
If some one will take the test and inspect on, if the OP is taking that tack the the Person that's going to do the testing should have been involved from the outset of the job.

Valid point Pete, if 3rd party should be inspected at each stage. But I'm guessing that it is all clipped direct surface etc. and all could be inspected in one visit.

Octopus · Sep 18, 2018

anthonybragg said:
Valid point Pete, if 3rd party should be inspected at each stage. But I'm guessing that it is all clipped direct surface etc. and all could be inspected in one visit.

Tricky to do that with the submain ...

Toneyz · Sep 18, 2018

Murdoch said:
Tricky to do that with the submain ...

Depends upon how it is installed.

Octopus · Sep 18, 2018

So the OP has recently been viewing the thread ........... and so far no responses

VERY POOR.

Joe · Sep 18, 2018

Strima said:
Why a 20 amp MCB for a 16 amp socket?

It's to power a single phase table saw. When I had this set up in my old garage it kept tripping on start up. I changed the MCB to a type C with higher amps to account for the surge when it starts up.

TJ Anderson · Sep 18, 2018

Murdoch said:
Part P, inspection and testing?

Insurance not paying out ..............................

Could be a very expensive "saving" the OP is trying to make.

In reality, there obviously won't be an electrician but that's up to him isn't it.
Also, the real truth is the job might well be better if an Electrician done it (you would hope so lol), but it is a lot cheaper for him as he has done it himself.

There is still a huge amount of work for sparks so don't worry about it.

The crux of it is, I am getting the feeling that we have a DIY section but it is only to tell people to get an electrician. If the members want to ban DIY advice, then let's vote for that. Get rid of the DIY section if required and lets be honest about it. Otherwise, I don't mind helping someone on here if they ask, within forum rules.

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