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Is it safe to supply a single phase machine from a 3 phase 5 pin commando socket?

Mike Hancock

The socket rating is ok (32A, FLA of machine is 24A), but current would only be drawn on one phase

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  • 0

    You might equally well ask whether it is safe to supply a SP circuit from a TP DB; or what about for example, a lathe with a 3 phase motor which is not running, but a SP lamp and DRO which are.

    I don't see a problem.  Graham's caveat concerning RCD protection is entirely reasonable, but even then, taking one phase off a 3 phase plug isn't any different from using a BS 1363 plug in a circuit which (due to age) has no RCD protection.

  • 0 in reply to Chris Pearson

    Perhaps the OPs fear is the commonly held mis-belief that taking a single phase load through a three phase RCD will lead to it tripping....

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  • 0 in reply to Chris Pearson

    Perhaps the OPs fear is the commonly held mis-belief that taking a single phase load through a three phase RCD will lead to it tripping....

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