An explosion-proof motor has the purpose of preventing large explosions in potentially explosive atmospheres. First, however, it is necessary to understand the classifications used for each risk scenario. This article intends to guide you to the best choice of explosion-proof motor that meets your needs.

What do you need to know about ratings?

NEMA, UL, and CSA safety standards are used to regulate the manufacture of ex-proof equipment. Therefore, all explosion-proof motors are regulated according to the applicable hazardous environment classification. However, not just any ex-proof motor will meet your needs. Why? If your workplace is a hazardous zone, some classes and divisions must be considered when applying equipment to that location. Let’s analyze what each class and division means.


Class I refers to locations where there are gases and vapors that can auto-ignite and cause hazards. Another classification is Class II. That refers to locations that present explosive dust in the environment. Last but not least,  Class III is the definition of locations where flammable fibers are present in the atmosphere.


Division I is the denomination for places where flammable materials can accumulate due to industrial operations. Differently, Division II refers to locations that become dangerous under abnormal conditions, for example, from explosions, seepage, or leakage.

Hazardous material groups

This classification refers to flammable materials found in hazardous location classes and divisions.

A, B, C, and D: Gases and vapors. For example, gasoline, acetone, and hydrogen.

E, F, and G: Combustible dust. For example, coal, aluminum, and agricultural products.


To be an explosion-proof motor, approval for use in Class I locations is vital. Do not rely on uncertified equipment. However, for each dangerous site where the division, classes, and groups vary, it will be necessary to pay attention to the type of motor you can use.

A Class I motor can contain the internal explosion without creating a rupture in its casing. This is possible because the flame paths cool the pressure created inside the enclosure. Now that you know the meaning of these safety ratings, you need to know which explosion-proof motor will meet your needs. So, correctly identify your danger area. You can do this with guidance from the safety regulatory authorities in your region. Once that’s done, identifying the best equipment for your job will be simple.

Also, another ex-proof equipment that would help keep your hazard under control is the exhaust fans, fans, lighting, and so on.

The best ex-proof solution

Explosion-proof motors and other equipment certified for hazardous areas are part of the Intrinsically Safe Store catalog. Our mission is to ensure that you find the perfect workplace hazard control solution. Our service values your work, and that’s why our work focus is to ensure safety and productivity. Explore our options for explosion-proof equipment such as motors, fans, lighting, alarms, flashlights, and more. With practicality in mind, you can search our catalog by choosing the class and division that best fits your needs.

To conclude, sign up for our Newsletter to receive exclusive deals and news on the intrinsically safe concept. Also, count on our hazardous area experts for the assistance you need. We’re ready to help!