Ungrounded System

[theonlyp]

Ground is connected to phase A on previously ungrounded 480V wye system. What is the line voltage at phase C?

My answer: Question implies 480V line-line voltage. Having phase A grounded on a previously ungrounded system just creates a floating ground. Therefore phase C's line voltage is still 480V?

Please help

Thanks

 

[Peele1]

Sounds good to me.

 

[BamaBino]

This is identical to problem 109 in the NCEES sample test.