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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> What supply can I use? https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1231445316 Message started by fry80657 on Jan 8^th, 2009, 8:08pm

Title: What supply can I use?
Post by fry80657 on Jan 8^th, 2009, 8:08pm

Hello there,

I have just started a job that used to be 6 offices which are now being turned into 6 flats. All flats located on the 1st floor. At this moment the meters and switch gear for all 6 flats is on the ground floor in the electrical cupboard. The 25mm tails for each supply go from the meter and terminate into a 60amp switch fuse. From the switch fuse a 16mm twin and earth cable is running up a riser into each respective consumer unit. Each flat will have a 9kw boiler 45amp MCB, 6kw cooker 32amp, sockets, lights, smoke alarm. So I have a few questions I would be very greatful if someone could help me with.

1.) Is the 16mm twin and earth supplying each flat sufficient for the circuit loads I have stated above? boiler 45A, cooker 32A, sockets 32A x2, lights 6A, smoke 6A?
2.) Is the 60amp switch sufficient for this supply or will I need to change it to a 80amp switch fuse?
3.) Is the 16mm twin and earth protected enough going to each flat or should I strip the all out and run Steel Wired Armoured?

Please help,

Thank you.

Title: Re: What supply can I use?
Post by cosbycarl on Jan 8^th, 2009, 10:06pm

wrote on Jan 8^th, 2009, 8:08pm:

1.) Is the 16mm twin and earth supplying each flat sufficient for the circuit loads I have stated above? boiler 45A, cooker 32A, sockets 32A x2, lights 6A, smoke 6A?

16mm in size is ok, but the use of 16mm t&e cant be used as the protective conductor isnt also 16mm which it needs to be. The size also depends on the length ambient temp etc.. too, which is unknown at this time. (it should be fine)

wrote on Jan 8^th, 2009, 8:08pm:

2.) Is the 60amp switch sufficient for this supply or will I need to change it to a 80amp switch fuse?

60a is fine

[quote author=fry80657 link=1231445316/0#0 date=1231445316]3.) Is the 16mm twin and earth protected enough going to each flat or should I strip the all out and run Steel Wired Armoured?

I would run SWA in (XPLE preferred) as the protective conductor will also be 16mm. The SWA has better mechanical protection too.

Title: Re: What supply can I use?
Post by Lectrician on Jan 8^th, 2009, 10:08pm

umm?

Maybe I will reply when more awake........

Title: Re: What supply can I use?
Post by LSpark on Jan 9^th, 2009, 1:34am

lol Lecc ;D