When a spark ignites volatile gas inside a motor, an explosion proof design contains the internal combustion to prevent a greater explosion or fire. An explosion proof motor is clearly marked with a nameplate that identifies its suitability for a given hazardous environment.
What is explosion proof electric motor?
Explosion proof motors are required for industrial applications with the presence of highly combustible, pervasive materials. … Rather, an explosion proof motor has features that prevent an internal motor explosion from igniting a larger, ambient, combustible atmosphere.
Does Class 1 Div 2 require explosion proof motor?
While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. … One important distinction is that the enclosure of a dust-ignition- proof motor is designed to exclude hazardous materials.
Are brushless motors explosion proof?
Available in 70-155mm frame sizes, EX motors feature an explosion-proof housing, making them suitable for use in explosive atmospheres.
Where are explosion proof motors used?
Explosion proof motors are designed for use in hazardous environments having certain explosive gases or materials present, like those found in the chemical, coal mining, textile, and petrochemical industries.
Can electric motor explode?
There are two scenarios in which an electric motor can cause an explosion: The surface temperature of the electric motor increases due to heating that occurs to match the ignition temperature of the flammable matter that has accumulated in the factory or the industrial structure, causing a spontaneous explosion.
Is a totally enclosed motor explosion proof?
Totally Enclosed, Fan-Cooled (TEFC) Motors have an external fan which circulates outside air to the motor. … Explosion-Proof (XPRF) Motors are completely enclosed to withstand an internal explosion of gas or vapor—the motor frame will not rupture or burst. Use these motors for safe operation in hazardous environments.
Does Class 1 Div 1 require explosion-proof?
For Clarification Purposes, Nema Enclosures Manufacturing does NOT provide Nema 7 or Explosion Proof Enclosure. In an environment where hazardous gases or dusts are always present a Class 1, Division 1 rated is required in North America and EX d for the rest of the world.
How do I know if my motor is Class 1 Div 1?
They must be built and labeled as explosion-proof. Class I, Division 1 motors must possess specific characteristics to be classified as explosion-proof. First, the motor must be designed to contain any internal explosions without rupturing completely.
Are all Tefc motors explosion-proof?
The enclosure is “Totally Enclosed”. This means that the motor is dust tight, and has a moderate water seal as well. TEFC motors are not secure against high pressure water nor submersible. They are also not explosion proof without additional modifications.
How do you know if an engine is intrinsically safe?
A system designed to be intrinsically safe requires full documentation of all the components and wiring employed. Immediately following installation there will be an inspection, followed by periodic inspections through the life of the equipment.
Can a DC motor explode?
Explosion proof DC motors can be in any wiring configuration: brushed or brushless, permanent magnet or electromagnetic field.
Is a brushless motor intrinsically safe?
The POST committee consulted with a well known tool manufacturer who confirmed that cordless tools, including models with brushless motors are not intrinsically safe and have the potential to spark. Therefore, hot work protocols must be followed when using cordless tools when working under these conditions.
What is an IEEE 841 motor?
IEEE-841 identifies the recommended practice for chemical industry severe duty squirrel-cage induction motors, 600 V and below. It was first issued in 1986 and was significantly revised and reissued as a Standard in 1994. Minor revisions were also made in 2001.
What is a Class 2 motor?
Class II Group F & G locations are atmospheres containing dust such as (F) Carbon Black, coal or Coke Dust, (G) Flour, Starch or Grain Dusts. 2. As required by Underwriters Laboratories and Canadian Standards Association, explosion-proof motors with Class II Group F & G approvals must have over temperature protection.
What is a Class 1 Division 2 motor?
Class I, Division 2.
This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which, in the judgment of the authority having jurisdiction, would become hazardous only in case of an accident or of some unusual operating condition.