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Error in on site guide maximum ZS

Newfutile

The maximum ZS for a type B 6 amp mcb  to BS EN 60898  is listed as 5.87 ohms by my calculations (and NICEIC , iCertify) this is incorrect.

6 x 5 (from 3-5 current trip) = 30 , 230/30= 7.666666 (I believe this is correct with BS7671 brown book , 7.66666 x 0.95 (cMin)=7.283333 x 80% (conductor temperature adjustment) = 5.826666

therefore 5.82 should not be exceeded .

Parents

  • Don't worry about it. It's all approximations and rounding up and down.

    For a start, 0.95 should be 0.94 but it isn't.

    The reciprocal of 1.2 is 0.8333r.

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  • Don't worry about it. It's all approximations and rounding up and down.

    For a start, 0.95 should be 0.94 but it isn't.

    The reciprocal of 1.2 is 0.8333r.

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