Final answer:
Parts of electrical equipment that can produce arcs or sparks should not be used in explosive atmospheres or near combustible materials to prevent fire and explosion risks. Fuses and circuit breakers are important safety features that help prevent these hazards by cutting off excessive electrical currents.
Step-by-step explanation:
Part of electrical equipment that produce arcs, sparks, etc., should not be operated or used in explosive atmospheres or in close proximity to combustible materials. Electrical safety systems and devices, such as fuses and circuit breakers, are employed to prevent thermal hazards by interrupting excessive currents. These safety mechanisms are crucial, especially in high-voltage systems where an interrupted current can lead to an arc capable of maintaining the electrical connection through ionized air.
Thermal hazards occur when electrical current causes excessive heating, leading to potential fire risks, such as from a short circuit or overloaded wires. Shock hazards arise when electric current passes through a person, potentially causing severe injury or death. In both cases, the employment of safety devices and adherence to proper guidelines can mitigate these risks.