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Panel Isolators - Different Voltages?

Les Spiteri
Where different voltages are fed into a panel is it permitted to isolate them both through the same isolator?
  • For example where you have a Main Fused Isolator for an incoming 3ph supply and a 110Vdc incoming from a UPS?

  • My experience says that as you quite often get auxiliary isolation contacts then it is possible.

  • However should these auxiliary contacts only be used for signalling and therefore cannot be used as a mean of isolation?

  • Also I frequently see 3 or 4 pole isolator used for single phase supply so can you use the remaining contacts to isolate another voltage?


Any thoughts would be most welcome.
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    All good stuff thank you, I also had an occasion recently where
    • We had a 3ph supply incoming going through a main fused isolator,

    • These were heavy cables at 120mm csa for large motors.

    • Strangely in my experience there was also an incoming neutral using for control (240Vac t a single phase)

    • The incoming neutral was only 2.5mm csa, this was put through an auxiliary contact on the MFI.

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  • 0
    All good stuff thank you, I also had an occasion recently where
    • We had a 3ph supply incoming going through a main fused isolator,

    • These were heavy cables at 120mm csa for large motors.

    • Strangely in my experience there was also an incoming neutral using for control (240Vac t a single phase)

    • The incoming neutral was only 2.5mm csa, this was put through an auxiliary contact on the MFI.

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