The equipment grounding conductor is permitted to be run separately from the circuit conductors when what occurs?

The correct answer is that the equipment grounding conductor is permitted to be run separately from the circuit conductors when a nongrounded-type receptacle is replaced.

This is rooted in the National Electrical Code (NEC), which recognizes that certain receptacles can be wired in a way that allows for separate grounding. When replacing a nongrounded-type receptacle, the requirement exists to ensure proper grounding practices to enhance electrical safety. This separate installation may be allowed under specific conditions where it helps to ensure compliance with safety standards.

The emphasis is on maintaining safety through proper grounding, particularly in situations involving older installations where ground protection might not have been adequately provided. Overall, this flexibility in wiring practices aims to ensure safe operation while preventing any potential shock hazards for users.

The other options presented do not align with the NEC guidelines regarding the separate installation of the grounding conductor; they do not offer scenarios where the separate installation is justified or permitted under code.