Class 1 Division 1 Electrical Equipment

There are four general differences in wiring method requirements for div.

Class 1 division 1 electrical equipment.

1 it s also allowed for div. There are two different divisions that exist in class i division 1 and division 2 along with three zones. 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.

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. Equipment suitable for class ii division 1 is permissible as well as equipment with the noted types of protection in b and. 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. 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. Low ambient conditions require special consideration. 1 fittings and flexible cords used in class i div.

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. For definitions of these locations see 1926 449. Class i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature.

Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. All applicable requirements in this subpart apply to all hazardous classified locations unless modified by provisions of this section. Note to paragraph g 4 of this section. 1 areas must be listed for class i div.

Under normal operating conditions 2. Or breakdown or faulty operation of equipment which causes them to become a source of ignition. Locations that would be considered to be class i include petroleum refineries gasoline storage areas dry cleaning plants spray finishing. 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.

100 of the national electrical code nec. Zone 0 1 2. Division probability of hazardous material.