A secondary rating of 240 3-phase 3-wire with corner ground will have voltage values from phases to ground of what?

In a 240-volt 3-phase 3-wire system with a corner ground configuration, one of the phases is connected to the ground, which establishes a reference point at zero voltage. Consequently, the voltages measured from each phase to ground will differ according to their position in the phase sequence.

In this corner-grounded system, one phase (the grounded phase) will read as 0 volts to ground. The other two phases will have a voltage of 240 volts when measured to ground. This configuration is typical in systems where one phase is grounded for safety and fault protection, as it minimizes the risk of machinery or equipment becoming live under fault conditions.

Thus, the correct voltage values from phases to ground will be 0 volts for the grounded phase and 240 volts for the other two phases, leading to the voltage values of 0, 240, and 240 for the system. This understanding is crucial for anyone working with 3-phase systems, particularly in ensuring safety and troubleshooting electrical issues.