Class 1 Division 1 Electrical Equipment

1 areas must be listed for class i div.

Class 1 division 1 electrical equipment.

Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. 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. If a wiring method is allowed for div. Zone 0 1 2.

Under normal operating conditions 2. Class 1 division 1 defines a specific hazardous location in which ignitible flammable gases or vapors exist. 1 it s also allowed for div. Division probability of hazardous material.

Or breakdown or faulty operation of equipment which causes them to become a source of ignition. Rule 18 202 rigid metal conduit hazardous location cables explosion proof or flame proof d boxes and fittings with threaded connection to conduit and cable glands shall be used for wiring in zone 21. Low ambient conditions require special consideration. The most widely used and recognizable equipment in class i division 1 locations is explosionproof equipment which is defined in art.

Because of repair maintenance or leakage. Equipment suitable for class ii division 1 is permissible as well as equipment with the noted types of protection in b and. 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.

In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist. The electrical apparatus must be capable of withstanding an explosion within it. 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. 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. 1 fittings and flexible cords used in class i div. Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. 100 of the national electrical code nec.

There are four general differences in wiring method requirements for div. Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature.