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Looking back on this UV transformer failure, it gets me to thinking I might need to pass on this thread to them to consider a change in the way they are doing their UV instalations.

Thanks folks for all the technical information !!!! A 208V delta primary and 480V/277V wye secondary will be the replacement unit enabling star point secondary grounding. Great to have all this knowledge available to tap into. Much Thanks, Jcall

The manufacturer "Dongan" rep. says that this particular transformer is 480 V delta primary, 208 V wye secondary and it can be wired in reverse with no adverse effects. He also says the 5 kva is big enough to handle the load. So the unit will be wired 3 phase 208 V wye supply to the transformer...

OK engineers, help me out here, if I am experiencing 6.1 amps/phasae A, 5.7 amps/phase B, and 5.8 amps/Phase C, at 480 volts, is a 6 KVA transformer cutting it too close for proper sizing? Also I am told that a 480 V Delta primary and 208 v wye secondary transformer wired in reverse is...

This transformer has a temperature rating rise of 115 degrees celcius, housed in a NEMA 3R case, in a mechanical room that gets about 95 degrees F in summer. jcall

Greetings, I have a swimming pool UV Lamp sanitizer wall mounted 3 phase 6 KVA buck/boost transformer 480v Delta Primary to 208v wye secondary. It is wired with the pri. and sec. reversed 208 v wye pri. up to 480 v sec.. The amp draw (measured at 480v while in use) is Phase A 6.1A, Phase B...