This page explains common UK house wiring diagrams including ring circuits, lighting circuits and dedicated appliance circuits. Diagrams show typical layouts, fuse or MCB ratings, and how electrical circuits are arranged in domestic installations.
The most common electrical circuits used in UK domestic wiring are ring circuits, lighting circuits and dedicated appliance circuits.
Below is shown a basic ring circuit for a UK House. The circuit is provided with a 32 A fuse /MCB in the consumer unit. There is generally a separate ring circuit for upstairs, downstairs and the kitchen. The circuit shown includes two spurs one from a junction box and one from a plug. socket.
Below is shown a basic lighting circuit for a UK house. The circuit is provided with a 5 A fuse/MCB at the consumer unit. Generally one lighting circuit is required for each floor of a typical house.
Below is shown single appliance circuit for a UK house. The circuit is provided with a 30 A fuse/MCB at the consumer unit for a cooker of less than 16kW rating. For a cooker rated above 16kW a 45A fuse of 50AMCB is required. Generally A single appliance unit is required for an electric cooker. .
A ring circuit is a wiring system commonly used in UK homes where sockets are connected in a loop and protected by a 32A breaker.
Lighting circuits in UK homes are typically protected by a 5A or 6A fuse or MCB.
A dedicated appliance circuit supplies power to a single high-load appliance such as an electric cooker.
Ring circuits are mainly used in the UK and are less common in other countries which use radial circuits.