240 V three phase 3 wire corner grounded Delta

[zappy]

I've never dealt with a system like this out in the field. Any stories or advice about this kind of system would be greatly appreciated. Thank you for your help.

Question. If this was an ungrounded delta, and I took my voltmeter phase to ground I wouldn't get a voltage reading, correct?

 

[LarryFine]

Question. If this was an ungrounded delta, and I took my voltmeter phase to ground I wouldn't get a voltage reading, correct?

I depends.

With a genuinely-floating system, a high-impedance voltmeter would read it as a grounded wye, because of capacitance between the system and earth.

A low-impedance meter, a solenoid tester, or a light bulb would read near zero, more like what you would expect, with very little real power available.

However, even a floating system can present a real shock hazard.

 

[TX+ MASTER#4544]

Question. If this was an ungrounded delta, and I took my voltmeter phase to ground I wouldn't get a voltage reading, correct?

2023 NEC
That is correct....zero voltage to ground. Hence the ghost moniker (monicker) or phanthom name.
It is a delta system.

Thanks for reading.
Comments accepted>
TX+MASTER#4544

 

[don_resqcapt19]

2023 NEC
That is correct....zero voltage to ground. Hence the ghost moniker (monicker) or phanthom name.
It is a delta system.

Thanks for reading.
Comments accepted>
TX+MASTER#4544

The terms ghost or phantom is not applied to a grounded conductor. It is applied to a conductor that is not connected to ground and has capacitance coupled voltage on it.
You don't apply those terms to the neutral of 120/240 or a 208Y/120 system. A corner grounded system is the same thing.

 

[electrofelon]

2023 NEC
That is correct....zero voltage to ground. Hence the ghost moniker (monicker) or phanthom name.
It is a delta system.

Thanks for reading.
Comments accepted>
TX+MASTER#4544

That really is not correct. See post #22.