Explosion-proof (XP) equipment uses enclosures built to contain an internal explosion and prevent it from igniting a surrounding flammable atmosphere.
Electrical equipment housed in an enclosure strong enough to withstand an explosion of flammable gas or vapor that occurs inside it, and designed with tight flame paths that cool escaping gases so they cannot ignite the flammable atmosphere outside. Explosion-proof equipment is commonly used in hazardous locations such as Class I, Division 1 areas under the National Electrical Code; the comparable international protection concept is called flameproof (Ex d).
A paint mixing room classified as a hazardous location is fitted with explosion-proof light fixtures, motors, and switches rated for the specific vapors present, and all conduit entries are sealed as required by code.
No, the term means the enclosure is designed to contain an internal explosion and prevent it from igniting the surrounding atmosphere — not that an explosion can never occur inside it.
Check the equipment's markings for the class, division or zone, gas or dust group, and temperature code, and confirm they match the classification of the area and the specific materials present.
Missing or loose cover bolts, damaged or painted-over flame path surfaces, unsealed conduit entries, and unauthorized modifications can all defeat the protection, so maintenance must follow the manufacturer's instructions.
Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.
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