HSE

Part J

Gas Safe

FWE

British gas

True

False

Part J

Bristish gas

Building Regulations Part P

IEE Regulations (17th Edition) (BS 7671:2008)

When there is an imbalance recognised between live and neutral conductors

a small trip switch operated by an overload and used to protect an electric circuit, esp a domestic circuit as an alternative to a fuse.

To stop electrical shocks

Important for equipment that is being used outside

When a live current affects you

When you get an electric shock

If live conductor comes into contact with any exposed metal object & this comes into contact with a person they will receive an electric shock

Path of least resistance = earthing circuit connecting all the metal parts & enabling current to safely discharge to earth.

To ensure safety from electric shocks.

A ground rod or a ground field's only purpose in life is to have a designed electrical path to dissipate a static discharge voltage (such as Lightning) to earth

The earth wire creates a safe route for the current to flow through if the live wire touches the casing. Earthing of an electric cooker. You would get an electric shock if the live wire inside an appliance, such as a cooker, came loose and touched the metal casing.

Done to keep things simple at home

It is provided to save money

To provide an equipotential platform on which electrical and electronic equipments can operate.

To provide an alternative path for induced current and minimize the electrical noise in cables.

To provide a low impedance path to facilitate the satisfactory operation of protective devices under fault conditions.

To ensure that system voltages on active lines remain within reasonable limits under fault conditions thereby preventing insulation breakdowns.

1900

1800

Another connection

an be connected to an existing socket, on either a ring main or a radial circuit, providing that socket does not already have a spur. That is only one spur per socket is allowed and the number of spurs must not exceed the number of sockets.