Electric supply for mains shower pump (grohe wireless) under bath

[Arthur]

I am installing one of these Grohe wireless shower pump/controllers under a bath. The house is entirely protected by an earth leakage trip (RCD) but I have a question about installation of cabling. I can bring the electric supply down from above inside a partition wall and join it to the Grohe cable. Do I join it with a junction box and bury it in the wall, use a waterproof junction box on the bathroom side, not bother with a junction box just join and have a cable patress or what? i.e. what is the correct way to install this/connect it up?

One other question is that the inlets are connected by copper/brass to existing pipework but do I need to bond the outlet copper/brass to the existing pipework or will all the pipework already be connected via the mains cable?

Thanks for your consideration

Arthur

[ARWadsworth]

If the joint is under a bath that has a bath panel then the juction box need not be waterproof. Do not bury a juction box in the wall. The shower will require a double pole switched fused spur some where. I would consider the loft to be an acceptable place for this. The RCD needs to be rated at 30mA.

Have you already got supplementary bonding in the bathroom?

Adam

[Arthur]

Thanks for your advice Adam, don't know what bonding there is, I am merely assuming that the existing supply is fully bonded. I guess that by bonding the outlet to the inlets that one way or another the pipework will be protected? Thanks Arthur

[ARWadsworth]

Have a read of the following.

[Arthur]

Thanks Adam.

Arthur