Final answer:
The statement regarding the separation of class 1 circuits from power conductors by a barrier being necessary is true. This is part of the safety regulations to protect against electrical hazards. Devices like circuit breakers, fuses, GFIs, and isolation transformers play crucial roles in ensuring electrical safety.
Step-by-step explanation:
The statement that class 1 circuits that are not functionally associated must be separated from power conductors by a solid and firmly fixed barrier is true. The National Electric Code (NEC) specifies that these precautions are necessary to prevent potential electrical interference and provide additional safety by reducing the risk of unintentional electrical connections between separate systems.
Electrical Safety Measures
Safety devices such as circuit breakers and fuses serve to disrupt excessive currents and prevent thermal hazards. The three-wire system contributes to safety against thermal and shock hazards by utilizing dedicated wires such as the live/hot, neutral, and earth/ground wires.
Moreover, devices like the Ground Fault Interrupter (GFI) are designed to prevent electric shock by rapidly detecting any loss of current that might indicate a leakage to an unintentional path. Additionally, an isolation transformer is another safety device which serves to decouple the device being powered from the main power source, further protecting against electric shocks.