7
MAKING THE ELECTRICAL CONNECTIONS
THIS WATER HEATER MUST BE EARTHED.
The electrical installation must be made by a competent person in accordance with the current
BS.7671 (IET Wiring Regulations) and
“Part
P”
of the Building Regulations and/or local regulations.
Wiring to the mains (Check the unit rating to see which applies).
Rating
Fuse/MCB
Isolating Switch
Cable Size
9.5 kW
40 amps
40 amps
6 mm² / 10 mm² *
10.8 kW
45 amps
45 amps
10 mm²
12.0 kW
50 amps
50 amps
10 mm² /16mm² *
* For cable runs over 10 meters or where cable is not flat clipped and surface mounted,
the larger size is the minimum required, as per BS.7671.
A means of local isolation and protection to the appliance is
recommended i.e. 50A fused spur.
A 50A RCBO circuit breaker with 30mA sensitivity must be fitted at the
local consumer unit on the same supply, or as BS.7671.
If the unit is fitted in a Bathroom:
9.5 kW and 10.8 kW Powerstream: A standard 45 Amp cord operated isolator switch is recommended.
12.0 kW Powerstream: A double pole 50 Amp isolator switch is required. This must be mounted out of
reach of the shower cubicle or bath.
Wiring the Powerstream
•
The unit has been designed to accept up to 16mm² supply cable. 6mm² & 10mm² cable can be
used as required. In all cases the outer sheath of the cable MUST project through the grommet
(diagram 7). This will prevent water getting into the unit.
•
Strip back the insulation on the
LIVE
(brown or red),
NEUTRAL
(blue or black) &
EARTH
(green/yellow or green) mains wires about 8mm.
•
Feed the cable through the entry grommet.
•
Connect the cables to the terminal block (diagram 7).
•
Make sure that the live, neutral & earth terminal block screws are tightened securely (1N/m
minimum).
•
Fit the front cover and tighten the retaining screws.
Failure to comply with these instructions could result in failure of the terminal block.
Ensuring the earth continuity
•
If the unit is fitted in a bathroom, to conform with the current BS.7671 (formally IET regulations),
the units earth continuity conductor must be effectively connected to
ALL
exposed metal parts of
ALL
other appliances in the room. The pipe work must be bonded.
Diagram 8
Wiring Diagram
Diagram 7
Cable Termination
7
