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Shower circuit design.

Sparkingchip

Why would an electrician install a 10 mm twin and earth circuit protected by a B32 MCB for a 8.5 kW shower?

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    Study fig 3A4 carefully, a B32 will carry 37A for at least 10,000 seconds

    Those graphs only show the maximum permitted disconnection time - any real device will be faster in practice. The only reassurance the standard gives is that the MCB won't trip within conventional time (1h) at 1.13x In - so a slightly enthusiastic B32 could validly trip after 3600s at just 36.16A.

      - Andy.

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  • 0

    Study fig 3A4 carefully, a B32 will carry 37A for at least 10,000 seconds

    Those graphs only show the maximum permitted disconnection time - any real device will be faster in practice. The only reassurance the standard gives is that the MCB won't trip within conventional time (1h) at 1.13x In - so a slightly enthusiastic B32 could validly trip after 3600s at just 36.16A.

      - Andy.

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