Power shower wiring

[GT1]

Yep.. done one recently.
Electric shower conversion to pumped mixer shower.
Used the old 6mm for the old 8.5KW electric shower, into an FCU, fused at 3amps, and from the RCD side of the board. Flex cable from the pump into the load side of the FCU.

Was very convenient as the old shower cable ran through the airing cupboard anyway, where the new shower booster pump was installed.

 

[SEC-Tom]

who mentioned 9.5kw. He asked about power shower not electric. Power showers draw low current no more than a couple of amps

This may sound silly but how come they are only small ampage? Is it just a pump that pumps the water out? Whereas an electric shower heats the water too?

 

[Hawk81]

This may sound silly but how come they are only small ampage? Is it just a pump that pumps the water out? Whereas an electric shower heats the water too?

you have it correct there. The power shower usually has a small transformer powering a pump. Thats it.

 

[JUD]

just looked at some diagrams for powershowers.

C) Electrical
1. The electrical installation must be in
accordance with current BS. 7671
(I.E.E. regulations).
2. The unit should be connected into a switched
3 amp double pole fused spur, with a
minimum contact gap of 3mm in each pole.
The switch must be fitted outside the
bathroom.
Alternatively, a double pole ceiling switch, with
a pull cord and a minimum contact gap of
3mm in each pole could be used inside the
bathroom.
For additional safety, it is recommended that a
residual current device be used with either of
the above switches.
3. The earth continuity conductor of the
electrical installation MUST BE effectively
connected electrically to all exposed parts of
the appliances and services in the room in
which the water heater is to be installed in
conformity with the current BS. 7671 (I.E.E.
wiring regulations).
WARNING : THIS APPLIANCE MUST BE
EARTHED.
4. We recommend using 1.0mm2 Twin and Earth
cable for this application. Connect the mains
cable in to the terminal block, ensuring that all
power is switched off before connecting to the
mains supply.
Recommended order : -
a) Strip back wire approximately 6.0mm.
b) Ensure wires are secure in the correct
terminal block holes.
c) Ensure that the mains cable is securely
clamped in the cable clamp provided
on the backplate.
5. Schematic wiring diagram.

schem ... DP switch nothing at all about RCD .. but the regs do say anything in zone 0,1,2 use RCD 30ma

You may want to read this again

 

[confused-fuse]

You may want to read this again

on the Schematic wiring diagram i mean not the write up ..

 

[davelerave]

electric showers -'power' and 'instantaneous' should have rcd protection

rules or no rules