Final answer:
Lockout/Tagout (LOTO) is the primary safety system used on de-energized circuits to prevent accidental energizing during maintenance. Circuit breakers and fuses protect energized circuits, while the three-wire system with grounding helps prevent electrical hazards.
Step-by-step explanation:
The type of safety system typically used on de-energized circuits is known as Lockout/Tagout (LOTO). This procedure ensures that dangerous machines are properly shut off and not started up again before the completion of maintenance or servicing work. The LOTO process includes isolating the energy source, which could be electrical, mechanical, hydraulic, pneumatic, or other types, and then applying locks and tags to the energy-isolating devices to prevent the flow of energy to the circuit or machinery. In electrical safety, devices such as circuit breakers or fuses serve to protect energized circuits by interrupting excessive currents and thus preventing thermal hazards. Additionally, the three-wire system with live/hot, neutral, and earth/ground wires contributes to safety by grounding the neutral wire and the case of the appliance, helping to guard against both thermal and shock hazards.