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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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    A 3-wire 3-phase ungrounded system is the norm for power distribution on merchant ships and I would expect navy ships.  Used both for 440 volt power distribution and 220/240 domestic distribution. Comes with double-pole switching for sockets, although I never saw double-pole fused plugs when UK style 13 amp sockets were used. Whilst earth leakage resistance was monitored, I do not recall ELCBs as such, only an alarm output when a predetermined value of minimum earth leakage resistance was breached. From memory, this was typically 220k ohms.

    Clive
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  • 0
    A 3-wire 3-phase ungrounded system is the norm for power distribution on merchant ships and I would expect navy ships.  Used both for 440 volt power distribution and 220/240 domestic distribution. Comes with double-pole switching for sockets, although I never saw double-pole fused plugs when UK style 13 amp sockets were used. Whilst earth leakage resistance was monitored, I do not recall ELCBs as such, only an alarm output when a predetermined value of minimum earth leakage resistance was breached. From memory, this was typically 220k ohms.

    Clive
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