Your understanding of Explosion proof in the world of intrinsically safe and Hazardous materials may be wrong. You see for a regular Joe, Explosion proof means it can withstand an ignition or a blast from an outside source. Something that the military are using today.

What does Explosion Proof mean

In Hazardous areas, Explosion proof means it will contain any detonation originating within the housing and prevent sparks within the housing from igniting vapors, gases, dust or fibers in the air surrounding it.


An “explosion proof “classification for a sensor/transmitter means that the housing has been engineered and constructed to contain a flash or discharge. Such housings are usually made of cast aluminum or stainless steel and are of sufficient mass and strength to safely contain an ignition should flammable gases or vapors penetrate the housing and the internal electronics or wiring cause an ignition. The design must prevent any surface temperatures that could exceed the ignition temperature of the gases or vapors covered by its Group rating.


The National Electrical Code (NEC) along with the National Fire Protection Association (NFPA) and Underwriters Laboratories (UL) have published a guide along with codes that classify hazardous areas into classes, divisions and zones.


How does an explosion occur?

What does explosion proof mean
Woman and man workers running at the construction site, suffocating. Carbon monoxide poisonous gas cloud.

The “Combustion” or “Fire” Triangle is used to classify Hazardous Locations in the Explosion-Proof industry.  A source of fuel (explosive gases,liquids, or vapors), source of ignition (fire, spark, or explosion) and oxygen must be present in the appropriate consistencies for an explosion to occur. Our Explosion-Proof Enclosures & Systems operate to prevent these three criteria from mixing in such a way that would generate an explosion and be hazardous to the surrounding environment.


Fuel — Fuels are flammable or combustible materials and can be gases, liquids or solids.

Heat — these are ignition sources and include an open flame, lit cigarette and sparks (such as from electrical current and static electricity shorts). A chemical reaction that creates heat can also ignite a fuel and oxygen mixture.

Oxygen — the most common source of oxygen is air, but oxygen can also come from chemicals called oxidizers. Examples of common oxidizers are some types of acids and chemicals such as chlorine, chlorine dioxide, potassium permanganate and potassium chlorate.


To learn more about what explosion proof means or any other Intrinsically Safe, Explosion Proof or Hazardous Area products, please contact our experts or call us on 832-699-6726
You may also browse our Explosion proof products such as: Explosion Proof Heater, Explosion Proof Fan, and Explosion Proof Lighting



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