What is the requirement for motors and generators in Class III, Division 1 and 2 locations?

In Class III locations, which are typically associated with the presence of combustible fibers or flyings, the requirements for motors and generators focus on preventing the ignition of these materials. The correct answer emphasizes that motors and generators must be totally enclosed. This design is crucial because it minimizes the risk of sparks or overheating components coming into contact with combustible dust or fibers present in the environment.

Totally enclosed motors provide several protective benefits. They prevent the ingress of dust and fibers into the motor, which could otherwise accumulate and pose a fire hazard. Additionally, the enclosure design helps contain any potential ignition source within the motor, thereby preventing it from igniting the surrounding atmosphere. This compliance with safety standards is vital in maintaining safe operational conditions in environments prone to combustible dust.

In the context of Class III Division 1 and 2 locations, ensuring the motors and generators are totally enclosed aligns with the requirements set forth by the National Electrical Code (NEC) and other regulatory standards. This stipulation serves to protect both the equipment and the surrounding workers from hazardous conditions.