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  • Practical Caravan

    CIRCUIT BREAKERS EXPLAINED

    Sep 05, 2019 4 minutes

    DESIGNERS TAKE INTO consideration two overriding constraints when equipping a caravan with a mains supply system:

    ■ Protection from damage and potential fire hazards caused by appliances failing, and thereby exceeding the current rating of the internal mains distribution wiring

    ■ Protecting the occupants of the caravan from lethal electric shocks in the event of an appliance becoming faulty

    Overcurrent protection

    Previously, overcurrent (high current demand and/or short circuit) conditions were handled by wire fuse links designed to melt and thereby isolate the supply should a fault situation occur.

    Nowadays, households – and caravans – are fitted with current-sensing circuit breakers, known as miniature circuit breakers or MCBs, which isolate the supply once a

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