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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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    It is my understanding that many, if not most, solar inverters fitted to the larger systems use unearthed three phase between the inverter output and step up transformer. These can be at 2.5MVA. I think these systems are ignored as they are in the middle of a field, and are not offered for inspection. I also believe that they have no circuit protection or isolation and would be interested if anyone can confirm or correct me.
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  • 0
    It is my understanding that many, if not most, solar inverters fitted to the larger systems use unearthed three phase between the inverter output and step up transformer. These can be at 2.5MVA. I think these systems are ignored as they are in the middle of a field, and are not offered for inspection. I also believe that they have no circuit protection or isolation and would be interested if anyone can confirm or correct me.
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