Final answer:
To guard live parts over 50V but less than 600V, equipment is permitted to be grounded or encased in insulating material.
Step-by-step explanation:
To guard live parts over 50V but less than 600V, equipment is permitted to be grounded or encased in insulating material.
This is because at voltages above 50V, there is a greater risk of electrical shock to humans. By grounding the equipment or encasing it in insulating material, the risk of accidental contact with live parts is minimized.
For example, electrical panels and transformers in buildings are often enclosed in insulating material to protect people from coming into direct contact with the live electrical components.