Wiring Circuit For Extension + Sparky Needed

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Barney Mcgruu

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Hi All, I live in Suffolk(Near Ipswich) and need some advice and a Electrician.

We have built a 2 storey extension onto our three bedroom house, it consists of 1 extra bedroom,1 extra bathroom, study, downstairs toilet and extended kitchen.

I was hoping to run the t&e and fit the back boxes, then pay a electrician to check the routes of the wiring then replace the consumer unit and connect all the sockets.

I have planned all the wiring in safe zones, so it will be surface mounted and finished with dot&dab.

Downstairs study: 4 double sockets, dedicated ring, radial to light fitting in study and Downstairs toilet

Downstairs toilet: as above, lighting sharing a radial with study.

Upstairs 4th bedroom: 3 double sockets on a radial, lighting on a radial, also supplying bathroom lighting.

2nd Bathroom: as above, lighting circuit shared with 4th bedroom also dedicated shaver socket.

Kitchen: New oven wire run in, that will be all in the kitchen for a while as we do not have the funds to complete yet.

As stated all wiring will be run in safe zones, it will then all go into the extensions loft space and pass through the old gable wall where it will come back down into the new Consumer unit.

Just wondered what you guys think of it and if there is any glaring mistakes, I also need a sparky to fit a new consumer unit and connect all the new and existing wires into it and also connect up all the sockets..

I know this can be a touchy subject and that is why I am fine with paying a electrician to check all the routes of the wiring that I have done.

Many thanks for any help you can give.

 
Hi Trailer Boy, thanks for answering.

I thought one or two parts would be overkill but I was unsure of how many sockets could go on a radial when using 2.5mm t&e and not 4mm.

Was hoping to get a Consumer unit with many spare ways so was not to worried withy it being overkill.

 
Thanks Andy

I think the max run is about 16 meters of cable so should be ok.
Rule of thumb guidance in BS7671 on site guide suggests that a 20A radial should give you no problems if you are only 16m of cable.

Don't waste money making it a ring unless you are expecting some serious heavy power usage in there!

Guinness

 
Last edited by a moderator:
Actaul limitation is Zs for circuit, and loading of course. Rewired a flat in a big Victorion villa once, lounge was so big it exceeded the recommendations for floor area, but tested at about half the Zs value allowed - there was only 10 sockets on the circuit, no problem what so ever.

 
Pity I did not find this site earlier, if I had I would of ordered 4mm t&e so no restrictions would be placed on it.

I can always use a 20amp as you guys say, so no worries in the end.

Thank you to everyone who posted, it has helped me a lot.

 
Do you still need a sparky???

Wouldn't be me as I'm about 200miles too far from you but have a good friend who I could recommend.

 
Pity I did not find this site earlier, if I had I would of ordered 4mm t&e so no restrictions would be placed on it.

I can always use a 20amp as you guys say, so no worries in the end.

Thank you to everyone who posted, it has helped me a lot.
unlikely, but it is still possible that even 4mm is undersized

 
I've tried to contact you via PM but it sys you can't use that facility, not sure how to pass you on the details of the chap I know who might be able to help you out as I don't think I'm allowed to post his details on a public forum????

 
I've tried to contact you via PM but it sys you can't use that facility, not sure how to pass you on the details of the chap I know who might be able to help you out as I don't think I'm allowed to post his details on a public forum????
Try now.

 
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