The rated voltages on power lines (300/300V, 300/500V, and 450/750V) are:
1. The values represent line voltage/phase voltage.
2. u0/u, where u0 is the phase voltage and u is the line voltage. Phase voltage is the voltage between conductors to ground or between metal shields, while line voltage is the voltage between conductors.
3. Terminology is explained in GB5023.
