If you are having an alteration of addition made to your electrical installation, your electrician must check (as well as other things) that the earthing and bonding arrangements you have are up to the required standard. This is because the safety of any new work you have done (however small) will depend on the earthing and bonding arrangements.
Earthing is used to protect people from the risk of electric shock. If the earthing arrangements within your electrical installation were defective or inadequate. You could receive an electric shock from the equipment or appliance metal casing. The purpose of earthing is to provide a path for electric fault current to flow safely to earth. This will enable the fuse to blow or circuit breaker to operate.
Bonding is the connection of the incoming metal gas and water pipes to the main earthing terminal. It is imperative for your protection from electric shock. In a correctly earthed installation, any appliance or piece of equipment that develops a fault to the metal casing will be quickly disconnected by the fuse blowing or operation of the circuit breaker.
Supplementary bonding is often found in bathrooms containing a bath or shower. This is to reduce the risk of electric shock where people may touch two separate metal parts. When an electric fault occurs in the installation In these locations supplementary bonding conductors connect the circuit protective conductor (CPC) of an installation e.g an electric shower to the hot and cold metal water pipes. This arrangement was common on installations up to June 30th 2008. With the introduction of the new 18th edition IEE wiring regulations BS7671 (2018), after this date the need for supplementary bonding has been reduced as all electrical installations in rooms containing a bath or shower need to have their circuits additionally protected by a 30mA (milli-Amp) Residual Current Device (RCD)
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