Correct me if I am wrong:
"Line Voltage" means the voltage between any pair of live wires in a 3-phase system.
"Phase Voltage" means the voltage between any live wire and neutral even if the neutral does not exist. One can always calculate the equivalent 4-wire wye voltages from the line voltages.
"Phase" should not be used to describe the two live wires in a 240/120 single phase system.
I know I will muddy the water here, but maybe we will come out knowing a bit more than we did.
"Line Voltage" means the voltage between any pair of live wires in a 3-phase system.
"Phase Voltage" means the voltage between any live wire and neutral even if the neutral does not exist. One can always calculate the equivalent 4-wire wye voltages from the line voltages.
"Phase" should not be used to describe the two live wires in a 240/120 single phase system.
I know I will muddy the water here, but maybe we will come out knowing a bit more than we did.