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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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  • 0
    Possible in many situations,  but In cases where you may want synchronous isolation of many supplies or devices, but cannot bring the cabling together for reasons of EMC or ratings,  then one switch operating multiple contactors may be an alternative.
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    Possible in many situations,  but In cases where you may want synchronous isolation of many supplies or devices, but cannot bring the cabling together for reasons of EMC or ratings,  then one switch operating multiple contactors may be an alternative.
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