What is required for multistage systems where one phase is grounded?

In multistage systems where one phase is grounded, it is necessary for that specific phase conductor to be grounded. This is important because grounding one phase helps to establish a reference point for the system and ensures that the ground potential is maintained. Grounding minimizes the risk of electrical shock and equipment failure by providing a safe path for fault currents.

Grounding a single phase in such systems aids in the overall stability and safety by controlling the voltages between phases and providing a means for overcurrent protection devices to function correctly. It effectively helps prevent hazardous conditions that could arise if a fault occurs. The focus on grounding only the designated phase helps to maintain the effectiveness of the grounding system while avoiding unnecessary grounding of all conductors, which could introduce complications or risks in the operation of the multistage system.