spurs of ring main in kitchen

[newdomestic]

Yes I am new so please be gentle, I have been looking at GF's house electrics as at sometime she wants a new (metal) lights up and she hasnt got earth on her lighting circuits. She has rewireable fuses. I am considering doing CU change whilst upgradin the lighting circuits.

Whilst having a look around, I have noticed also she has some single 1.5 spurs off 2.5 ring sockets. These spurs have no fuse switches on their circuit branch.

Ok from my training 17th ed, I reckon spurs like this are supposed to have fused switches.. in previous editions was this not the case??? and if I do a CU change will I have to add these switches to bring up 17th ed standard.

Thank in advance for your patience and your helpful advice.

 

[martinxxxxxx]

Yes I am new so please be gentle, I have been looking at GF's house electrics as at sometime she wants a new (metal) lights up and she hasnt got earth on her lighting circuits. She has rewireable fuses. I am considering doing CU change whilst upgradin the lighting circuits.

Whilst having a look around, I have noticed also she has some single 1.5 spurs off 2.5 ring sockets. These spurs have no fuse switches on their circuit branch.

Ok from my training 17th ed, I reckon spurs like this are supposed to have fused switches.. in previous editions was this not the case??? and if I do a CU change will I have to add these switches to bring up 17th ed standard.

Thank in advance for your patience and your helpful advice.

When you say "she hasnt got earth on her lighting circuits" Are they wired with twin and earth wire?

Remember to test the whole installation with a calibrated meter and do a PIR BEFORE you start, else you could end up with a system that won't run due to the RCD constantly tripping, not sure this would inspire confidence wit the GF

Those spurs are gonna need FCUs to connect them, better still put a wire in and put them on the lighting circuit.

If you do change the CU everything will need to be brought up to the 17th editions really, else you are going to have to put a load of deviations on your installation cert.

Personally I would not chose the other halfs pad to do my first job, if that is what this is. Are you registered if not, go through LABC, you don't want to cause problems for her when she sells the place.

Also I would plan each circuit doing all your calcs for each wire run and refereanceing them to the regs, so that if you look back over the job you can see exactly whats what.

Have you seen Kevin Boons Guides

Kevin Boone's Cable Selection Guide: here NOW HERE: http://web.archive.org/web/20070327014113/http://www.kevinboone.com/cableselection_web.pdf

Hope this helps

Martin

 

[newdomestic]

Manty thanks for your reply.

The lighting circuit is just twin cable, no earth cpc..

You say wire the spurs into the lighting circuit??? i am puzzled!
The spurs are for a cooker extractor hood and a dryer...

 

[martinxxxxxx]

AAH I assuned they were for the lighting.

martin

 

[TPES]

I'd recomend rewiring the lighting circuit for sure, Otherwise notices on the consumer unit to state there no cpc on the circuit and ONLY plastic fittings to be used

I would change the 1.5mm to 2.5mm minimum, should'nt have 1.5mm spured from a 32a RFC.

You need a 2.5mm into a FCU, then out the load side put your 1.5mm in.

 

[Spudnik]

IAlso i wouldnt have 1.5mm feeding an appliance such as a dryer

Why not?

 

[TPES]

Why not?

Ha ha, Just actually thought about what i just said, Doh! me and my hasty replies