In which scenario should equipment grounding conductors be increased in size?

The correct choice relates to situations where ungrounded conductors are increased in size. When the size of ungrounded conductors increases, it is important to correspondingly increase the size of the equipment grounding conductors to ensure adequate safety. The grounding conductor is designed to carry fault current in the event of a malfunction or short circuit, thus minimizing the risk of electric shock or fire.

The grounding conductor must be large enough to handle the increased fault current that might result from larger ungrounded conductors. This ensures that the grounding system can effectively trip circuit protection devices, providing protection against electrical hazards. Hence, maintaining the appropriate size for grounding conductors based on the size of ungrounded conductors is crucial for the safety and effectiveness of the overall electrical system.