Class 1 Division 1 Electrical Requirements

29 cfr 1910 subpart s electrical 1910 307.

Class 1 division 1 electrical requirements.

National electrical code nfpa 70 chapter 5 article 500. 1 areas must be listed for class i div. Zone 2 group iia. Class i zone 0 or zone 1 locations may not abut class i division 1 or division 2 locations.

There are four general differences in wiring method requirements 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. Protection techniques for hazardous areas north america. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature.

The class 1 division 2 area is limited to a distance of 10 from the source. Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. If a wiring method is allowed for div. 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.

Class i division 2 group d. Class i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2. 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. 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.

Recommended reading for this topic. 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. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. 1 fittings and flexible cords used in class i div.

In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist. 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. No other aspect of industrial safety receives more attention in the form of codes standards technical papers and engineering design. You ll find that in open areas the class 1 division 1 area is limited to a distance 5 from the source.

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.