Installation Guide

17
Electrical continuity
The plumbing or heating system installer should have
these aspects checked to ensure compliance with
current IEE Regulations. If in doubt please contact the
Speedfit Technical Advisory Service or consult your
local Electricity Authority.
IEE Guidance Note 7 provides useful guidance on the
design of electrical installations where there is increased
risk of electric shock. It recognises that the requirement
for supplementary bonding may be relaxed where metal
taps and plastic pipes supply other bathroom fittings.
Similarly a metal bath or radiator not connected to
an extraneous-conductive-part is not required to be
connected to the local supplementary conductors.
Supplementary bonding
to bathrooms
Pipe material Supplementary bond
required between
Comments
Cold water Hot water Central heating
P P P
Earth terminals of protective
conductors of class I and
of class II equipment and
accessible exposed conductive
parts of the building structure.
Bonding of metal taps metal
radiators or metal baths is
not required unless the bath
is connected to the metallic
building structure.
P M M
Hot water pipe, central heating
pipes, earth terminals of
protective conductors of class
I and class II equipment and
accessible exposed conductive
parts of the building structure.
A bond is not required to
the taps either hot nor cold,
or to metal baths unless
connected to the metallic
building structure.
P P M
Central heating pipes, the
earth terminals of protective
conductors of class I and class
II equipment and access to
exposed conductive parts of the
building structure.
Bonding of metal water taps
is not required, nor metal
baths unless connected
to the metallic building
structure.
M M M
All metal pipes, earth terminals
of protective conductors class
I and class II equipment, and
accessible exposed conductive
parts of the building structure.
Metal pipes themselves can
be used as bonding
conductors if joints are metal
to metal and electrically
continuous.
M M P
All metal pipes, earth terminals
of protective conductors of class
I and class II equipment, and
accessible exposed conductive
parts of the building structure.
Metal central heating
radiator does not require
bonding.
P = Plastic M = Metal
NB: All Waste Pipes are plastic.
1. Supplementary bonding is carried out to the earth
terminal protective conductors of class I and class II
equipment within the bathroom. A supplementary
bond is not run back to the main earth.
2. Metal window frames are not required to be
supplementary bonded unless they are electrically
connected to the metallic structure of the bonding.
3. Metal baths supplied by metal pipes do not require
supplementary bonding if all the pipes are bonded and
there is no other connection of the bath to earth.
4. All bonding connections must be accessible
and labelled ‘Safety Electrical Connection –
Do Not Remove’
Connecting to other
plumbing fixtures
As shown in the Trade Price List, the Speedfit range of
fittings includes valves, taps, adaptors and connectors
for the plumbing of all typical domestic appliances
and fittings.
Discharge pipes
Speedfit pipe should not be used to provide the discharge
from unvented cylinders, unvented water heaters and
sealed systems via the temperature relief and pressure
relief valves.
Water heaters
Speedfit recommend that mains supply pipework to
unvented water heaters (up to 15ltr capacity), be run in
metal pipes.
Adequate provision must also be made regarding thermal
expansion of water from a water heater. The use of an
expansion relief valve and/or an expansion vessel must
be used where water expansion is not possible back into
the mains supply.
Ensure water temperatures do not exceed those
recommended for Speedfit.
Clip
Metal pipe Metal pipe
Speedfit pipe and fitting
Earth lead
Clip