Mrs RJB is at it again!!

[rjb]

Mrs RJB wants to run a circuit outdoors so we can have some lights at bottom of garden. (Actually Mrs RJB wants RJB to do this!!! Here we go again I am saying to myself)

Fine. I will stall her for a year or so and perhaps keep it for NICEIC assessor minor / major job (not sure which one it would be)

Anyway my CU is at front of house in basement, garden at back so cable run to back door is about 40m perhaps.

Forgetting about cable size and correction factors for the moment. can I legitimately run twin and earth to back of house into junction box, then SWA for the rest of the run.

Or should I run SWA all the way (very expensive).

Or should I run T&E in metal conduit (earthed of course!) However, I was thinking NICEIE would prefer to see SWA in this situation.

Oh I need know this. If I use jucntion box option what is best one for connecting Twin and Earth with SWA.

Thanks.

 

[Cremeegg]

My assessor (not NICEIC) was happy with such a job recently. T&E from CU in house - tortuous route through lofts - to junction box in cupboard then change to SWA to go outside. Used T&E mainly for ease of threading it through the lofts although it was certainly cheaper than SWA. Joined in IP65 junction box - easily accessible for testing and for assessor to see use of piranha nuts to earth SWA.

Your route may require additional impact protection for T&E; if I used conduit then I'd always draw in singles.

 

[luminaire]

Could you not take your supply from a socket at the back of the house?

You could for example convert the socket (assuming here that it's a double) into a dual socket and thereby add an 13A FCU in order to run the SWA from.

You could run to one of these and then plug your lights or whatever else you want to use it for into it.

 

[bernardgreen]

As this job has a "Mrs" specification put in a nice duct to allow for the extras that will be added to the specification just (or un-justly) as you start to back fill the trench. TV aerial feed to end of garden, etc etc etc.....and the butler call bell cable to call you to bring her refreshments

 

[mdbalson]

As this job has a "Mrs" specification put in a nice duct to allow for the extras that will be added to the specification just (or un-justly) as you start to back fill the trench. TV aerial feed to end of garden, etc etc etc.....and the butler call bell cable to call you to bring her refreshments

 

[r.bartlett]

Could you not take your supply from a socket at the back of the house?

You could for example convert the socket (assuming here that it's a double) into a dual socket and thereby add an 13A FCU in order to run the SWA from.

Are you allowed to do this?


Cheers

Richard

 

[Spark123]

Providing the socket is on a ring there is nothing stopping you from creating a spur from this point providing the required power consumption isn't too high etc, I think the OP is a sparks so they were just mindstorming. This type of work will be notifiable to the local area building control under part P also.

 

[rjb]

I think the OP is a sparks so they were just mindstorming

Spark123. I am flattered you think I'm a spark. Not quite yet! Just the small matter of finishing Level 3 2330, 2381(2), NICEIC or other similar bodies assessment ......(and on and on it goes)

I actually thinking ahead and need a couple of installations for NICEIC compancy assesment and this one on my own property seemed a good one.

Just chewing the cud with you lot how you pro guys would approach it.

 

[r.bartlett]

Providing the socket is on a ring there is nothing stopping you from creating a spur from this point providing the required power consumption isn't too high etc, I think the OP is a sparks so they were just mindstorming. This type of work will be notifiable to the local area building control under part P also.

For some strange reason I thought outside supplies needed to be separate and protected?

Cheers

Richard

 

[luminaire]

It is protected when you remove the 13A fuse from the FCU

 

[Spark123]

They don't need to be separately run from the CU, as for the protection - any socket will need to be on an RCD etc. If you need a supply greater than 13A which is the largest a spur from a ring final circuit can supply or there is no capacity left on the ring final circuit then it may be run direcly from the CU. As the OP is 75% spark then he will more than likely have a good understanding of the requirements.

 

[oharaf]

Like this one chaps. I must say I would be looking for a fused spur from localised double also if it is just for lights.
But then again our wives are never satisfied so a direct link rom CU would be my approach, again with T&E to IP65 junction box then SWA into garden.

Cost and ease of work v. important factor.

I am also Level3 C&G, waiting for 2392 and 17th Ed. followed by NICEIC.

Think you fellas provide excellent knowledge bank with top hole humour

 

[rjb]

Oharaf

Nice to know there's others out there striving to become sparkies. I was thinking of using this project as the major part of the NICEIC assessment, I know my wife will get further ideas for garden electrics so i think I will run a dedicated circuit to outdoors which can be easily upgraded for future. (I imagine NICEIC will like that sort of future thinking when designing maybe?)

But stop press, that aside, the above doesn't need to be major work at all.

Anyway this outdoors thing is contagious in my family. I mentioned last night to my sister about getting major work to get signed off and believe it or not(!) she wants a out building converted in about 18 months time after she has sorted out permissions with BC.



This one sounds like it's come out of a C&G text book. She's an arts teacher and does her own arty stuff on the side. She wants her rather large outbuilding (40m from house) to become a studio, but she also wants a mega size kiln.

So we're talking about upgrading meter tails, Henley blocks, RCD upgrading, SWA, new circuits, cuddly toy (teachers are good at naming these) and so on and so on...

(This is on top of her stupid electric fence for chickens idea she already has me penciled in for. )

 

[Cremeegg]

If it's a mega size kiln you mightt be in for a new supply rather than just upping the size of the tails. Right out of one of Scaddons books - he even used a kiln as an example.

 

[marcam]

hi i recently done a kiln in a school a 50m run, was done in 25mm 4 core swa along and terminated up into a emergency stop panel which then went off in flexible conduit along the wall into the kiln itself, the kiln required a 3 phase supply but the school allready had that installed (yes i did it some years before) i came out of the 3phase board into a 20amp mk mcb which went of outside the school and back into the kiln, and thus worked out really well for the job, i hope i can help you what kind of kiln is it etc and whats the cable route etc. thanks