Final answer:
Functional managers must ensure that electrical safety systems are in place where maintenance is performed on energized circuits, including circuit breakers and a three-wire system. Additionally, safety devices such as GFIs, isolation transformers, and a stocked supply of laboratory safety equipment are required.
Step-by-step explanation:
Functional managers overseeing maintenance operations on energized circuits must ensure that the locations are equipped with appropriate electrical safety systems and devices. These include circuit breakers and fuses that are capable of interrupting excessive currents to prevent thermal hazards. It is essential to have systems such as the three-wire system in place that utilizes live/hot, neutral, and earth/ground wires, with the neutral wire and the case of the appliance grounded to guard against both thermal and shock hazards. Additionally, devices like a ground fault interrupter (GFI) are crucial for detecting loss of current to unintentional paths, thereby preventing electric shock. For enhanced safety, an isolation transformer may be used to insulate the power device from the source.
Maintenance of critical safety devices includes having a maintained stock of laboratory supplies, knowledge of the location of safety equipment like fire extinguishers and eyewash stations, as well as familiarity with procedures for emergency situations, such as storms or natural events that could necessitate urgent maintenance of high-voltage equipment.