Earthing and bonding

Earthing and bonding

Proper earthing and bonding are essential for the safety of your electrical installation.


Without earthing, a fault in your installation could mean you would get a severe electric shock if you touched any ‘live’ metal part – which could even be something like a metal water pipe.

Earthing prevents this by providing a way for a fault current to flow to earth. It will also trigger any protective device – such as a fuse or a circuit breaker – that’s been installed on your fuse board.

So if your cooker develops a fault that generates a current, that current will be channelled to earth, the fuse or circuit breaker will be triggered, cutting off the current, and your cooker will be safe to touch – though it won’t, of course, be working any more!

Normally we would connect a main earth cable (colour-coded green and yellow) from the fuse board to the gas and water supply pipes into the building.


Bonding is a way of reducing another possible risk – the chance that when there’s a fault in your electrical installation you might touch two separate metal parts carrying different voltages, which could (again) give you a severe electric shock.

At Tack Electrical we make sure that any metal pipes which could come into contact with electrical wiring are connected to each other and to the fuseboard. This means that if any live wire touches a metal pipe the fault current will flow to earth and – as above – it will also trigger a fuse or circuit breaker and disconnect the supply until the fault is fixed.

To ensure this happens we will normally go to your boiler and connect the (earthed) mains water pipe to the other pipes that flow and return for your heating system, your mains gas supply and your hot water. Usually this means we can do all the work in one place (unless plastic poly pipe has been used).

If you have a tin or cast iron bath we recommend connecting that to the towel rail and then to the sink supply pipes.

Bonding is particularly important if you have an older type of fuse board – see Fuse board upgrades.

If you are a property owner, a landlord or a tenant we recommend reading this leaflet about earth bonding – and if you’re in any doubt at all, give us a call immediately. You could save a life – and it might be your own.


Posted on

April 4, 2015