Tuesday, October 16, 2007

Permanent boxes
Numerous types of boxes are used in stable installations. Some types are designed to be provisionally inhabited by workers.

Permanent boxes include the following:

Equipment boxes

· Fuse box

A distribution board (known in the United States as a (circuit) breaker panel, panelboard, or load center or for old ones, fuse box) is a growing enclosure for several electrical circuit breakers. These are usually placed in two columns. Small single-phase boxes, with the waves in just one row, are known as consumer units in Britain. Distribution boards are characteristically found in central locations inside buildings and often serve as the point at which electricity is distributed within a building. Circuit breakers can be used to physically de-energize electrical circuits when the downstream wiring is being serviced.

Circuit breaker panels are constantly dead front, that is, the operator of the circuit breakers cannot contact live electrical parts. During servicing of the sharing board itself, though, when the cover has been detached and the cables are visible, North American breaker panels commonly have some live parts exposed. British distribution boards usually have the live parts enclosed to IP20, even when the cover has been removed for servicing.

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