Open Delta Connection - part 2

[knole2]

I have encountered an open delta 3-phase 240V service in PA and have been confused by so many different explanations. I understand the B (high or stinger leg) is at 208V to ground. Can a single pole breaker then be used (if connected to the B phase bus) to power a 208V piece of equipment?

 

[davidbeach]

No.

Sure, it might work for a while, but it will be no end of trouble and confusion for anybody who has to work on the system, and it loads up both transformers.

 

[waross]

What David said. Not recommended.

Bill
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"Why not the best?"
Jimmy Carter

 

[busbar]

For this application, you would need a single-pole MCCB rated at 208- or 240 volts, and not 120 or 120/240 volts.