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ELECTRICAL CONNECTION
8
ELECTRICAL CONNECTION
DANGER: RISK OF ELECTRIC SHOCK!
B ISOLATE THE MAINS ELECTRIC SUPPLY
BEFORE STARTING ANY WORK AND
OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
All regulation, verification and safety mechanisms have
been rigorously tested in the factory and are ready for
use.
8.1
ELECTRICAL SUPPLY
• Supply: 230V - 50 Hz, 140 Watts.
• Cable: PVC insulated 0.75 mm2 (24 x 0.2 mm)
temperature rated to 90 °C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• This appliance must not be connected to a three
phase supply.
• IP20.
• Wiring must comply with the latest IEE wiring
regulations.
8.2
EQUIPOTENTIAL BONDING
8.2.1
MAIN EQUIPOTENTIAL BONDING
Main equipotential bonding is carried at the origin of the
electrical installation and connected to the main
electrical earthing terminal. Metal pipes can be used as
bonding conductors if joints are metal to metal and
electrically continuous. The IEE Wiring Regulations (BS
7671:2008) require that extraneous conductive parts
must be connected to the main electrical earth. The
main bonding of incoming metallic services must be as
close as practical to their entry point, before any branch
pipe work and a maximum of 600mm from an internal
meter. Bonding conductors must be copper and the
same size as other bonding conductors and not less than
10mm2. The bonding conductors must be permanently
fixed to the metal pipes with clamps and labels (to BS
951) in a visible position to allow for inspection.
8.2.2
SUPPLEMENTARY BONDING
Supplementary bonding is normally carried out in an
area of increased shock risk e.g. bathrooms. Consult a
qualified electrician for them to determine if the
installation requires supplementary bonding as
specified in the 17th edition of the IEE Wiring
regulations (BS 7671:2008).
32
8.3
CONNECTION
The mains supply to the appliance must be
either:
B The mains electrical supply to the water
heater and system wiring centre must be
common and through either a common
fused double pole isolator or a fused
three pin plug and unswitched socket.
B The isolator shall be situated next to the
water heater for new systems and, where
practicable, replacement heaters.
B The isolator must have a contact
separation of 3mm minimum between all
poles. Any system connected to the
heater must not have a separate
electrical supply.
B Connect the mains electrical cable to an earthed
power point.
8.4
POWER CABLE
The appliance is provided with a labeled power cord and
earthed main plug.
If the power cable gets damaged it must
be replaced with a genuine spare part.
Fig. 48 Mains power cable connections
6 720 646 322 (2012/05)
6720608913-09.1AL
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