Class 1 Division 1 Electrical Equipment

100 of the national electrical code nec.

Class 1 division 1 electrical equipment.

Low ambient conditions require special consideration. Class 1 division 1 defines a specific hazardous location in which ignitible flammable gases or vapors exist. If a wiring method is allowed for div. The most widely used and recognizable equipment in class i division 1 locations is explosionproof equipment which is defined in art.

Or breakdown or faulty operation of equipment which causes them to become a source of ignition. Division probability of hazardous material. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. Zone 0 1 2.

Note to paragraph g 4 of this section. 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. All applicable requirements in this subpart apply to all hazardous classified locations unless modified by provisions of this section. Class i locations consist of areas where gases vapors or liquids may exist that have the potential to become flammable or ignitable.

Class i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2. Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. 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. Under normal operating conditions 2.

1 fittings and flexible cords used in class i div. There are four general differences in wiring method requirements for div. 1 it s also allowed for div. In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist.

Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. 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. Equipment suitable for class ii division 1 is permissible as well as equipment with the noted types of protection in b and. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature.

Because of repair maintenance or leakage. For definitions of these locations see 1926 449. 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.