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Switched and unswitched fused connection units, without sockets, use BS 1362 fuses for connection of permanently wired appliances to a socket-outlet circuit. They are also used in other situations where a fuse or switch (or both) is required, such as when feeding lighting off a socket-outlet circuit, to protect spurs off a ring circuit with ...
The ring starts at the consumer unit (also known as fuse box, distribution board, or breaker box), visits each socket in turn, and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit. Ring circuits are commonly used in British wiring with socket-outlets taking fused plugs to BS 1363. Because ...
Flexible appliance cords require protection at a lower current than that provided by the final circuit overcurrent protection device. This additional protection device may be contained within either the appliance plug (by far the most common solution) or the connection unit (a fused socket or possibly a fused spur protecting the socket).
In an electrical power distribution system, a ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network. It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch ...
To prevent installation of fuses with an excessive current rating, later fuse boxes included rejection features in the fuse-holder socket, commonly known as Rejection Base (Type S fuses) which have smaller diameters that vary depending on the rating of the fuse. This means that fuses can only be replaced by the preset (Type S) fuse rating.
Single-phase sockets [clarification needed] have two current-carrying connections to the power supply circuit, and may also have a third pin for a safety connection to earth ground. The plug is a male connector, usually with protruding pins that match the openings and female contacts in a socket.
Cutout (left) attached to a feeder line (connection at the right not shown). The lower wire goes to the transformer A set of pole top cutouts (with C-shaped bodies) protecting a transformer on a 12.47 kV distribution line. One fuse is blown and the tube is hanging down. Lightning arresters are mounted on the crossarm opposite the fuse cutouts.
A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.