Final answer:
The three-wire system is the correct wiring configuration on a household fire alarm system initiating circuit, providing safety against thermal and shock hazards.
Step-by-step explanation:
The correct wiring configuration on a household fire alarm system initiating circuit is the three-wire system. This system utilizes live/hot, neutral, and ground wires to guard against thermal and shock hazards. The neutral wire is connected to the earth at the voltage source and user location, forcing it to be at zero volts and supplying an alternative return path for the current through the earth. The case of the appliance is also grounded to zero volts. Additionally, a circuit breaker or fuse is in series on the active (live/hot) wire to protect against thermal overload.