Final answer:
Safety systems and devices are required on equipment with the potential for inadvertent operation that could cause injury, such as circuit breakers, fuses, and a three-wire system for electrical safety, as well as the presence of guards, shut-offs, and labels.
Step-by-step explanation:
If there is a possibility of inadvertent operation of equipment that could cause injury, certain safety systems and devices are required to prevent accidents and potential harm. This includes electrical safety measures such as circuit breakers and fuses to interrupt excessive currents, and a three-wire system to guard against thermal and shock hazards. This three-wire system typically includes live/hot, neutral, and earth/ground wires, with grounding of the neutral wire and the case of the appliance.
Additionally, equipment may require guards, emergency shut-off features, safety interlocks, warning labels, or other protective measures depending on the specific risk involved. Knowing the location of safety equipment such as fire extinguishers and eyewash stations in a laboratory is also essential for reducing injury risks.