A "'consumer unit "'is a type of distribution board ( a component of an electrical power system within which an electrical power feed provides supply to subsidiary circuits ).
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Two-pole common trip breakers are common on 120 / 240-volt systems where 240 volt loads ( including major appliances or further distribution boards ) span the two live wires.
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Possible locations include on a utility pole serving the property, in a street-side cabinet ( meter box ) or inside the premises adjacent to the consumer unit / distribution board.
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In both cases, modern boards handling supplies up to around 100 A ( CUs ) or 200 A ( distribution boards ) use circuit breakers and RCDs on DIN rail mountings.
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European installations continue to use primarily RCDs installed at the distribution board, which provides protection in case of damage to fixed wiring; In Europe socket-based RCDs are primarily used for retro-fitting.
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To provide some protection with an interrupted neutral, some RCDs and RCBOs are equipped with an auxiliary connection wire that must be connected to the earth busbar of the distribution board.
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In both ring and radial circuits, the circuit wiring starts at a consumer unit or distribution board, traverses in turn a number of sockets or devices ( point-to-point style ), before terminating.
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In Europe, RCDs can fit on the same DIN rail as the MCBs, however the busbar arrangements in consumer units and distribution boards can make it awkward to use them in this way.
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Neutral is usually at or very near to earth potential, being earthed either at the substation or at the service entrance ( neutral-to-earth bonding is not permitted in the distribution board / consumer unit ).
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Each link contains an entrance hall with two sets of doors ( creating a rudimentary'air-lock'to prevent excessive cooling when entering and exiting the base ) as well as a change-room, ablution facility and electronic distribution boards.
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