What is essential to do after isolating equipment for maintenance?

After isolating equipment for maintenance, it is crucial to follow several safety protocols to ensure the safety of personnel and the integrity of the equipment. Placing a maintenance tag on the equipment is essential because it communicates to all personnel that the equipment is out of service and being worked on, preventing accidental re-energization.

Testing the equipment to verify that it is not charged is equally important, as this ensures that no live electrical current is present, significantly reducing the risk of electrical shock. Additionally, completely opening switches before removing fuses is a safety measure that helps avoid any possibility of a fault occurring while personnel are working on or near the equipment.

Considering these actions collectively enhances the safety of maintenance procedures, making it clear that all these steps are crucial and should be performed. Therefore, choosing the option that encompasses all of these actions acknowledges the comprehensive approach necessary for safe electrical maintenance.