Earth Bonding

Earth Bonding

Earth bonding

What Is Earth Bonding?

 In a building, there are typically a number of services other than the electrical supply that employ metallic connections in their design which need earth bonding these include water piping, gas piping, HVAC ducting, and so on. A building may also contain steel structures in its construction. When an earth fault takes place in an installation, the external conducting surfaces of the installation and the earth mass in the vicinity may attain higher potential with reference to the source earth. This is why earth bonding is needed as it reduces the mass and takes the fault current back to the Safety device to cut the electrical system and stop any potential danger.

Did You Know?

It is necessary that all such parts are earth bonded to the electrical service earth point of the building to ensure safety of occupants. This is called equipotential earth bonding.


There are two aspects to equipotential bonding: the main earth bonding where services enter the building and supplementary earth bonding within rooms, particularly kitchens and bathrooms.

Main earth bonding should interconnect the incoming gas, water and electricity service where these are metallic but can be omitted where the services are run in plastic, as is frequently the case nowadays. Internally, earth bonding should link any items, which are likely to be at earth bonding potential or which may become live in the event of a fault and which are sufficiently large that they can contact a significant part of the body or can be gripped.

Small parts, other than those likely to be gripped, are ignored because the instinctive reaction to a shock is muscular contraction, which will break the circuit.

Trade Facilities Services can install your Earth Bonding from just £200 if you have any further queries please call us on 0203 637 1446 or book an appointment on line