What must be capable of isolating each dispenser individually from all external voltage sources?

The requirement for a means to isolate each dispenser individually from all external voltage sources is essential for safety and maintenance purposes, particularly in environments where flammable materials are being handled, such as fuel dispensing operations. Dispensing equipment isolation means serve this purpose by providing a method to disconnect power to each dispenser without affecting others, ensuring that maintenance can be performed safely and that any electric faults can be managed without risking safety or operational integrity.

This individual isolation is crucial because it allows for the safe servicing of a single dispenser while others remain functional. In contrast, options like electrical panels, grounding conductors, and disconnect switches do not provide that level of localized control and isolation for each dispenser. Electrical panels would control multiple circuits and devices, grounding conductors are intended for safety by preventing shock hazards, and commercial disconnect switches typically operate at a broader service level rather than isolating specific dispensers. Therefore, isolation means specific to dispensing equipment is the necessary solution to meet safety and operational standards in such settings.