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ISO124: iso124 input signal for phase to phase AC voltage

Part Number: ISO124
Other Parts Discussed in Thread: ISO224, AMC3330, AMC1350

Hello, 

I am working on the high voltage sensing circuit design. I would like to use iso124 or iso224 to be a isolator. input voltage can be phase to neutral (120V, 250V) and phase to phase (208VAC, 480VAC) and so. I found out iso124 and iso224 are single end input, so it is easy to work with resistor divider for 120VAC and 250VAC, but When I try to use it to work with 208VAC and 480VAC, I don't find a way to connect phase to phase signal to iso124 or iso224. anybody has some hint?