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Isolating multiple supplies

Udtwmc
I have two supplies of different types coming into a distribution rack

(type 1 : 230V 1Ph+N  max load 25A

type 2 : 110VAC reduced low voltage / centre tapped earth max load 55A ) 


id like if I can to isolate both using one 63A 4 pole isolator (coloured red yellow for emergency switching off). I can see from both the wiring regs and EN 60204 (this machine will require CE Marking) that every supply requires a means of isolation, but I can’t be sure if this means it’s own independent isolator. I kinda feel that I shouldn’t be mixing different supply types on the same isolator but then it would be actually useful in this particular installation. So is this bad practice?


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    It is quite common, and often very desirable  to gang switches so that supplies are obliged to be isolated together, rather than separately.  This is no sillier than switching all 3 phases together when the downstream load is 3 fuseboards of single phase equipment, or the isolation of off peak and 24hr mains from a common point in a building with storage heaters.  (where it could be one of these. )

    In your cases the voltages are different, but so long as the inter stage insulation exceeds the highest present there is no technical objection.

    It is always possible that an international standard failed to foresee a common situation however.

    Another approach would be shunt trips on a common stop, so one out all out.



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  • 0
    It is quite common, and often very desirable  to gang switches so that supplies are obliged to be isolated together, rather than separately.  This is no sillier than switching all 3 phases together when the downstream load is 3 fuseboards of single phase equipment, or the isolation of off peak and 24hr mains from a common point in a building with storage heaters.  (where it could be one of these. )

    In your cases the voltages are different, but so long as the inter stage insulation exceeds the highest present there is no technical objection.

    It is always possible that an international standard failed to foresee a common situation however.

    Another approach would be shunt trips on a common stop, so one out all out.



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