An electric motor is considered explosion-proof when it is capable of containing an internal explosion without rupturing and putting the entire industrial facility at risk.
Is a Class 1 Div 2 motor explosion proof?
While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. The characteristics of dust-ignition-proof motors differ from those of their Class I counterparts.
What is meant by explosion proof?
To meet the criteria for the explosion proof rating, an enclosure must be able to contain any explosion originating within its housing and prevent sparks from within its housing from igniting vapors, gases, dust, or fibers in the air surrounding it. …
Are brushless motors explosion proof?
Explosion proof DC motors can be in any wiring configuration: brushed or brushless, permanent magnet or electromagnetic field. … Limit the maximum temperature of the motors so any flames that happen to escape the motor are cooled to a level that cannot ignite the external environment.
What class is explosion proof?
Explosion-Proof Enclosure: An enclosure which can withstand the pressures resulting from an internal explosion of specified gases, and contain such an explosion sufficiently to prevent the ignition of the explosive atmosphere surrounding the enclosure (for Class I, II and III).
What is the difference between Class 1 Division 1 and Class 1 Division 2?
Class I locations are those in which flammable vapors and gases may be present. Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.
How can you tell if a motor is flameproof?
- Service/class temperatures.
- Reference pressure – waveform smoothing at 5kHz.
- Flame path width and gaps.
- Ignition tests with variety of explosive gas mixtures, five tests per mixture.
- Flame transmission.
- Enclosure strength.
- Enclosure must contain explosions at 1.5 times standard explosive pressure.
What is difference between flameproof and explosion proof?
The terms explosion proof and flameproof have the same meaning in that they are constructed in such a way that an internal ignition of a flammable atmosphere will not be transmitted outside of the enclosure and thereby preventing the ignition of surrounding flammables.
What is dust ignition proof?
A dust ignition proof component prevents dust entering from outside. Arcs, sparks and heat generated inside of the enclosure will not be able to ignite the exterior surroundings near the component.
How do explosion proof enclosures work?
During an explosion, gases escape through any paths or openings that exist in the enclosure. Explosion-proof enclosures are designed so that escaping gases will be sufficiently cooled as they exit through openings that are long in proportion to their width.
Are brushless motors 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 Ex d protection?
Ex d or “Flameproof” means that an enclosure or junction box is constructed and certified as Explosion Protected according to the “Flameproof” standard. … Ex e Increased Safety boxes are normally manufactured from an engineered plastic and are generally suitable for surface applications and in non-fiery mines.
What is a Class 1 Division 2 area?
Class I, Division 2 or Zone 2 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions. In this area the gas, vapor or liquids would only be present under abnormal conditions (most often leaks under abnormal conditions).
Is Tefc the same as 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.