Final answer:
The term "explosion proof" refers to the design of electrical equipment to contain any internal explosions and prevent ignition in surrounding hazardous environments. This is an important safety feature that protects against thermal and shock hazards by managing excessive currents and proper grounding.
Step-by-step explanation:
The term "explosion proof" in relation to electrical apparatus refers to a type of equipment that is designed to prevent explosions in hazardous environments. This means that if there is an internal explosion within the apparatus, the device is able to contain it and prevent it from igniting the external environment, which could contain flammable gases or dust. The main purpose of an explosion proof design is to contribute towards electrical safety by mitigating the risk posed by sparking and overheating, which are known as thermal and shock hazards.
Electrical safety systems and devices, such as circuit breakers and fuses, are utilized to interrupt excessive currents to prevent thermal hazards. Additionally, the three-wire system, which includes live/hot, neutral, and earth/ground wires, guards against both thermal and shock hazards by grounding the neutral wire and the case of the appliance.