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Q4:  What is a consumer unit?

A: It also used to be called fusebox. But modern ones dont have fuses inside any longer.

Old Type Modern Type

Modern consumer units (picture bottom right) usually use DIN-rail mount breakers. The rail and the shape of the front opening are standardized but the busbar arrangements are not. Therefore mixing of brands should generally be avoided and where unavoidable care should be taken to ensure that the breaker chosen is a good fit for the busbars.

With the introduction of the recent 17th Edition IEE Wiring Regulations Consumer units now in the UK must provide RCD protection to all cables embedded in walls excepting high integrity circuits such as a "Burglar Alarm", "Smoke Alarms" or "Door Bell" etc.

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