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Explosion proof motors are designed to reduce or eliminate the risks traditional motors present in the presence of combustible materials. Traditional motors feature parts that can spark or generate too much heat in environments with dust and other flammable materials. This poses a significant fire risk that explosion proof motors are designed to negate by being able to fully contain internal explosions and prevent the ignition of larger, combustible atmospheres.
This guide will break down some of the different types of explosion proof motors to help you determine the right one for your facility.
UL certified explosion proof motors fall into two distinct classes:
These classes are further divided into different divisions, which include:
For example, a Class I, Division 1 location contains combustible vapor or gas during normal operating conditions, whereas a Class I, Division 2 location contains combustible vapor or gas only during equipment faults.
The classes and divisions are further classified into groups based on the type of combustible materials present. Class I groups include:
Class II groups include:
If a UL listing identification plate indicates that a motor is a Class 1, Division 1, Group C and D explosion proof motor, that means it can prevent explosions in areas that contain Group C and D combustible materials during normal operating conditions.
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