RCD protection on multiple 3 phase machines

[Dave 85]

Hi guys

Just wanted to pick your brains on the following...
I've been doing some work in a Jaguar dealership and they've had a health and safety guy come around and recommend that all existing socket circuits and 3 phase car ramps should be given RCD protection. I have been asked to quote for said work.

Now we are looking at 10 3phase ramps and around 12 socket circuits fed from 4 different DB's (old brown square D ones) which are all 20 odd meters apart.

Ideally I wanted to replace at least 3 of the DB's so I could put RCBO protection on all socket circuits but I'm not sure what to do with the ramps....as far as I'm aware you cant get 3phase RCBO's??? and having an RCD main switch on each board seems like a very poor option.

One though is to replace the DB's, keep MCB's on the ramps but then install remote RCD isolators for each ramp. Obviously I'm trying to make this cost effective.

Any advice would be much appreciated.

Thanks

 

[davethsparky]

There is another special risk involved here, there is a significant risk of the mini hitler on a power trip having to give the place a clean bill of health if he doesn't find something ridiculous to put on his report.