Is the copper ribbon or tape shield of a medium-voltage cable allowed to serve as the required equipment grounding conductor for a circuit supplied by a 1,500-volt system?

The option regarding the use of a copper ribbon or tape shield as the required equipment grounding conductor for a circuit supplied by a 1,500-volt system is correct because it recognizes the conditional nature of grounding practices based on specific standards and regulations.

In general, the use of cable shields for grounding purposes is permitted under certain conditions outlined in electrical codes, such as the National Electrical Code (NEC). These conditions often include factors such as the cable's construction, the level of installation, the environment in which the cable is used, and the specific regulation governing the system in question.

If the cable is designed in a manner that its shield effectively fulfills the grounding requirements, and if it meets the necessary safety standards and installation guidelines, then it can be utilized as an equipment grounding conductor. However, it is crucial to ensure that all safety parameters and electrical code stipulations are followed to prevent any risks associated with grounding faults, ensuring overall electrical safety for both personnel and equipment.

Therefore, stating that the use of the copper shield is contingent upon meeting certain conditions accurately reflects the guidelines set forth in industry standards, allowing for flexibility while ensuring compliance to necessary safety protocols when handling medium-voltage systems.