Advice Needed Please

[T&Earth]

I have been ask to install a new kitchen ring and oven radial circuit, this will probably be 32A and 20A respectively (waiting to hear from customer on ratting the oven).

The current supply is a TT system with a very old front end RCD supplying Wylex rewirable consumer unit.

As the new cables will be concealed they will need protecting with an RCD (17th edition)

Normally I would change consumer unit as I know front end RCD’s are not current standard, but there are a few wiring issues eg missing CPC at lighting points etc and the customer is on a tight budget.

What I’m thinking of doing is install a 63A RCD garage C/U with 20 / 32A MCB feeding this from a spare way in old board, but the biggest fuse I can find is 45A (green)
Am I thinking right or is there a better way to do this?


Any advice appreciated

Many Thanks

 

[rocker]

The best way to do it would be split the tails in a henley block, run that into a little 2 way or shower unit, with an RCD incomer and 2 seperate MCBs and run from there, using it as a supplementary consumer unit. That way you don't need to touch the existing wiring. However, I would strongly recommend to the customer to get existing looked at if no CPCs etc.

I wouldn't run it from a spare way in an old wylex.... very rough. Running one circuit I think theres nothing wrong with it regs-wise, although it is bloody awful, but having 2 cicuits on it would be a big no-no anyway (essentially, disregarding your RCD etc, what you'd be doing is sticking 2 circuts on 1 fuse).

Your old incoming RCD is probably the 100mA incoming RCD required on a TT installation.