Final answer:
Feeder overcurrent devices and branch circuits must indeed be accessible only to authorized persons to maintain electrical safety protocols. These safety devices are integral to preventing thermal and electrical shock hazards and require knowledgeable handling for safety and system integrity.
Step-by-step explanation:
The statement that feeder overcurrent devices and branch circuits must be accessible to authorized persons only is True. Electrical safety systems and devices like circuit breakers and fuses are designed to interrupt excessive currents and prevent thermal hazards, as well as shock hazards. It is crucial to ensure that these safety devices remain accessible only to those who have the proper knowledge and training to deal with electrical systems to prevent accidental harm or system malfunction.
Modern electrical systems use the three-wire system, including live/hot, neutral, and earth/ground wires, with the neutral wire and the case of the appliance grounded to protect against electrical hazards. Additionally, ground fault circuit interrupters (GFCIs) and other systems like isolation transformers further improve safety by preventing electric shocks.
Accessibility to feeder overcurrent devices and branch circuits by trained personnel ensures that in the event of a fault, safe and proper maintenance or resetting can be performed, thereby preserving electrical safety protocols. Without supervision, unauthorized handling of these devices could lead to further electrical hazards, including the risk of electrocution or fire.