Final answer:
The prerequisites for safe operation of lifting devices are knowing where safety equipment is located and understanding electrical safety systems and devices.
Step-by-step explanation:
The familiarity of two things that are prerequisites for safe operation of lifting devices are knowing where specific safety equipment is located in the laboratory and understanding electrical safety systems and devices.
For the first prerequisite, it is important to know the location of safety equipment such as fire extinguishers and eyewash stations in case of emergencies.
Regarding electrical safety systems and devices, they are used to prevent thermal and shock hazards that can occur when operating lifting devices.