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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.
If there is a 30 mA protective device in use and there is a 10 mA burden from various sources then the unit will trip at 20 mA. The individual items may each be electrically safe but a large number of small burden currents accumulates and reduces the tripping level.
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 the breaker rating is much higher than that of any one socket outlet, the system can only be used with fused plugs or fused appliance outlets.
(3) The consumer unit and obviously its final circuits, plus the tails connecting the consumer unit either directly to the meter or to a supplier fitted isolator, belong to the owner of the premises. (If an owner has their own isolator fitted between the meter and consumer unit then naturally they would own it and the tails on both sides of it).
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For the consumer, price is only one part of total cost of a product. The consumer has the additional costs of transportation, usage and eventually, disposal of the product. Together, these costs are referred to as the total customer cost (TCC). In contrast to price, which is a producer-oriented concept, TCC focuses on the consumer and includes ...
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