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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> CU Layout https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1081807840 Message started by Al_Yeti on Apr 12^th, 2004, 11:10pm

Title: CU Layout
Post by Al_Yeti on Apr 12^th, 2004, 11:10pm

Ok ello ello this is cool , anyway enough of that HIT ME!

CU Layout

I have to have to CU's cant do split or single none that ting ok!

I got to MK SENTRY CU one with RCD one with Isolater

FIRST SET UP WITH RCD
1. Down Stairs Ring(32A)
2. Kitchen has three seperate radial legs what to do with them? dont want to destroy kitchen which is only way to put them on ring.(2*16A)???
3. Shower Electric 10.5kw(50A)

SECOND WITH ISOLATER
4. Up stairs Lighting (6A)
5. Down stairs Lighting (6A)
6. Boiler(6A)
7. Alarm / Security Lights(6A)
8. Up stairs Ring(32A)

Problem i got is the kitchen sockets what RCD Rating should i use? ad's to 114A's i think anyhow tell me what you think

Title: Re: CU Layout
Post by Pro-Spark on Apr 12^th, 2004, 11:20pm

Did I read that right that you have 3 radials on 2 mcb's

Tony

Title: Re: CU Layout
Post by al-yeti on Apr 12^th, 2004, 11:58pm

not really the radials are on the kitchen at present and everything else will be new as i wont be touching the the kitchen for a while, so there are 6 sockets in total all running from one fuse somewhere via junction box's trouble is i cant put them into a ring so not sure what to do with them???????worse case i will have to chase out the kitchen walls which are a flat roof with no ceiling access.

What about the rest? espcially RCD rating to what i gave

Title: Re: CU Layout
Post by plugwash on Apr 13^th, 2004, 10:44pm

sockets in any form of radial no matter how it spurs can be put on a 20A breaker if the cable is 2.5mm

normally you would use something like a 80A current rating 30ma trip rcd

generally i would say that all downstairs sockets should be on the rcd expect possibly one specifically for the freezer

whether you put the upstiars sockets on a rcd is your choice

Title: Re: CU Layout
Post by scotspark on Apr 15^th, 2004, 1:37am

as plug said bout kitchen on 20A mcb but i'd put all sockets on rcd personally :-*

Title: Re: CU Layout
Post by L.Spark on Apr 15^th, 2004, 11:42pm

Not sure how you can run 2.5 radial at 20A, if its installed in thermaly insulated wall in or out of conduit, max is 18.5A :o.