Final answer:
When working on shut down conveyor systems, the prevention of electrical hazards is crucial, particularly by ensuring systems are correctly de-energized and safeguarded against accidental reactivation.
Step-by-step explanation:
When conveyor systems are shut down for maintenance, it is especially important to concentrate on systems and devices that prevent electrical hazards. This includes ensuring that the system is properly de-energized and cannot be accidentally turned back on, which might endanger workers performing maintenance. Such safety measures are critical to protect against electrical shock, which occurs when electric current passes through a person, and thermal hazard, which results from electrical overheating. Using electrical safety systems and devices during maintenance work is essential to prevent such hazards from occurring.