Class 1 Division 1 Electrical Requirements

29 cfr 1910 subpart s electrical 1910 307.

Class 1 division 1 electrical requirements. Class 1 div 2 groups a b c and d for enclosure cooling systems posted on august 20 2020 september 17 2020 by barry slotnick when you are working with hazardous materials it is important to know exactly how the materials and compounds are classified. There are four general differences in wiring method requirements for div. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. 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. Class i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2. Class i zone 0 or zone 1 locations may not abut class i division 1 or division 2 locations. All applicable requirements in this subpart apply to all hazardous classified locations unless modified by provisions of this section.

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. 1 areas must be listed for class i div. An explosion proof motor certified for use in a class i division 1 location may also be operated in a class i division 2 area provided the motor meets the group and t code requirements. Zone 2 group iia.

Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature. In any case you don t want to make the determination as to where the class 1 division 1 area ends and the class 1 division 2 area ends. Class division hazardous location 33 introduction a major safety concern in industrial plants is the occurrence of fires and explosions. For definitions of these locations see 1926 449.

Tefc totally enclosed fan cooled motors and odp open drip proof motors can be used in division 2 locations provided they do not have ignition sources. 1 fittings and flexible cords used in class i div. National electrical code nfpa 70 chapter 5 article 500. Understanding the nec hazardous location option.

Recommended reading for this topic. Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. 1910 307 g 4 iii 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 division 2 group d.

You ll find that in open areas the class 1 division 1 area is limited to a distance 5 from the source. If a wiring method is allowed for div.