installing rcd fcu 13 amps 30 ma feeding socket outlets 3 phase

jon p · Sep 18, 2013

Hello everyone!! first time I joined forum here.i dont really have experienced working in commercial buildings,but asking advised from you guys wel be much appreciated..though I have experienced in 1 phase and domestic properties. my friend called me to add sockets in his business at the market which is a breakfast bar.i opened the db which has 3 phase supply ,is it possible to fit a 30ma rcd fused connection unit feeding 4 sockets?is there be a possible of overload coz I know hes using some coffee machines or something to plug in. any advised guys.thanks.

Richard Burns · Sep 18, 2013

Welcome to the forum, hope you find it useful.

If you are unsure about what you are doing it may be best to consider whether you should be doing it.

However the easiest thing to do if you need to install four sockets is to know the likely items being connected into them, coffee machines can have high current draw, then you can design the circuit to suit the load.
If you need a 32A circuit then run a radial in 4mm taking account of installation methods, or in a 2.5mm ring, if you can manage on 20/25A then run a radial in 2.5mm.
RCD protection would probably be a good idea and the easiest method in that case would be to use an RCBO in the board, if they are available.
A 13A RCD FCU would probably not have the capacity to run 4 sockets using heating equipment, but you need to know the current draw before installing the circuit.