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3 wire 3 phase ungrounded systems

Former Community Member
Former Community Member
I suspect I already know the answer but are 3 phase, 230 volt, 3 wire ungrounded systems permitted in a UK installation?


I know this is common practice in some parts of the world but it's not something I've come across in the UK.


Just for clarity this would entail a delta connected secondary with 230 V between phases requiring separate earth fault detection.


I wait with abated breath.


Bill
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    I would probably install the transformer at the point of utilisation with a standard circuit probably to a earthed three phase socket outlet, then install the transformer feeding directly and incorporated into the appliance supplied through a plug and flex.


    I would not install the transformer at the distribution board then run a circuit to where the supply is required as that is far more problematic when it comes to specifying circuit protection and the type of cable to be used.


    Is the equipment that is to be supplied actually double insulated or does it require an earth connection?
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  • 0
    I would probably install the transformer at the point of utilisation with a standard circuit probably to a earthed three phase socket outlet, then install the transformer feeding directly and incorporated into the appliance supplied through a plug and flex.


    I would not install the transformer at the distribution board then run a circuit to where the supply is required as that is far more problematic when it comes to specifying circuit protection and the type of cable to be used.


    Is the equipment that is to be supplied actually double insulated or does it require an earth connection?
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