Can open type motors like squirrel-cage induction motors be used in Class 1 Division 1 locations?

Open type motors, such as squirrel-cage induction motors, should not be used in Class 1 Division 1 locations due to the presence of flammable gases or vapors that can easily ignite. Class 1 Division 1 areas are characterized by the likelihood of hazardous concentrations of flammable substances being present during normal operations.

The design of open type motors does not provide adequate protection against the ingress of moisture, dust, or flammable materials, which could lead to ignition sources. For motors in such environments, specialized enclosures that can contain any potential sparks or heat generated during operation are required to enhance their safety.

In summary, since open type motors lack the necessary features to safely operate in environments where flammable vapors are present continuously, they are not suitable for use in Class 1 Division 1 locations without significant redesign or protection, leading to the conclusion that the appropriate answer is that they cannot be used in that setting.