Flameproof equipment Flameproof equipment:
The marking identifier for this technique is "d." is defined as a type of protection where the enclosure will withstand an internal explosion of a flammable mixture that has penetrated into the interior, without suffering damage and without causing ignition, through any joints or structural openings in the enclosure, of an external explosive gas atmosphere consisting of one or more of the gases or vapors for which it is designed.

Flameproof enclosures are used primarily to house arcing and sparking contacts such as in switches, circuit breakers, and motor controllers.

Flameproof equipment is often use in combination with increased safety protection. The illustration here shows an example of equipment protected by this combination of techniques.

LocationsLocations:
This protection technique shall be permitted for equipment in Class I, Zone 1 or Zone 2 locations.

A flameproof luminaire (Courtesy of Cooper Crouse-Hinds)

 

NOTE: This is an unformatted excerpt from our online fire protection training library.