
Hazardous Location Enclosures

Hazardous location enclosures are specialized electrical enclosures designed to provide a high level of protection for electrical components operating in hazardous locations. These locations include environments that may contain flammable gases, vapors, or combustible dusts, which can cause explosions or fires if ignited by electrical sparks or arcs.
Hazardous location enclosures are typically made from materials such as cast aluminum or stainless steel, which provide durability and protection against corrosion. They are designed to prevent the entry of hazardous materials into the enclosure and to contain any sparks or arcs that may occur inside the enclosure.
Hazardous location enclosures are classified according to the type of hazard they are designed to protect against. For example, Class I enclosures are designed to protect against flammable gases and vapors, while Class II enclosures are designed to protect against combustible dusts. They are also classified by their level of protection, which is typically denoted by a rating such as NEMA or IP.
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FAQs
What is an inert gas?
An inert gas is a type of gas that is non-reactive under normal conditions and does not easily undergo chemical reactions with other substances.
What are combustible gases?
Combustible gases are gases that have the potential to ignite and burn when exposed to an ignition source, such as a spark or flame.
What are considered hazardous substances?
Hazardous substances are any chemicals or materials that have the potential to cause harm to human health or the environment.
3 common reasons to use purge systems
They allow electrical enclosures to be installed in hazardous areas without the need for explosion proof enclosures.
They recycle the air inside of an enclosure, reducing the internal temperature.
They help reduce the effects of corrosion on components housed within the enclosure.
How does a purge system work?
Purge systems use incoming air from a supply line, solenoid valves, pressure gauges and pumps, to constantly maintain a positive pressure inside an enclosure. This prevents any flammable gases from entering the enclosure potentially causing an ignition event to occur. By maintaining a positive pressure within the enclosure, moisture and corrosive gases are also prevented from entering the enclosure and damaging components. Most purge systems will ensure that the air inside the enclosure is recycled a certain amount of times within a given time period. This air recycle function assists in maintaining a cooler temperature within the enclosure.