Class 1 Division 1 Electrical Equipment

In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist.

Class 1 division 1 electrical equipment.

Note to paragraph g 4 of this section. Equipment suitable for class ii division 1 is permissible as well as equipment with the noted types of protection in b and. If a wiring method is allowed for div. If equipment has been approved for use in a division 1 hazardous location it can be used in a division 2 hazardous location providing it is in the same class and group.

Or breakdown or faulty operation of equipment which causes them to become a source of ignition. Zone 0 1 2. A class i division 1 or division 2 location may be reclassified as a class i zone 0 zone 1 or zone 2 location only if all of the space that is classified because of a single flammable gas or vapor source is reclassified. The most widely used and recognizable equipment in class i division 1 locations is explosionproof equipment which is defined in art.

The substance referred to by class has a high probability of producing an explosive or ignitable mixture due to it being present continuously intermittently or periodically or from the equipment itself under normal operating conditions. 100 of the national electrical code nec. Division probability of hazardous material. 1 it s also allowed for div.

Because of repair maintenance or leakage. Class i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2. Under normal operating conditions 2. Class i locations consist of areas where gases vapors or liquids may exist that have the potential to become flammable or ignitable.

All applicable requirements in this subpart apply to all hazardous classified locations unless modified by provisions of this section. Class 1 division 1 defines a specific hazardous location in which ignitible flammable gases or vapors exist. 1 fittings and flexible cords used in class i div. 1 areas must be listed for class i div.

Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. The electrical apparatus must be capable of withstanding an explosion within it. There are two different divisions that exist in class i division 1 and division 2 along with three zones. For definitions of these locations see 1926 449.

There are four general differences in wiring method requirements for div. Low ambient conditions require special consideration. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable.