Class 1 Division 1 Electrical Requirements

Understanding the nec hazardous location option.

Class 1 division 1 electrical requirements.

Protection techniques for hazardous areas north america. The class 1 division 2 area is limited to a distance of 10 from the source. All applicable requirements in this subpart apply to all hazardous classified locations unless modified by provisions of this section. 1 areas must be listed for class i div.

If a wiring method is allowed for div. Class i division 2 group d. 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 i division 1 class i division 2 class ii division 1 class ii division 2 class iii division 1 class iii division 2.

No other aspect of industrial safety receives more attention in the form of codes standards technical papers and engineering design. 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. Recommended reading for this topic.

You ll find that in open areas the class 1 division 1 area is limited to a distance 5 from the source. Zone 2 group iia. Class i zone 0 or zone 1 locations may not abut class i division 1 or division 2 locations. 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.

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. Can i use a piece of equipment approved for use in a division 1 hazardous location in a division 2 hazardous location. There are four general differences in wiring method requirements for div. National electrical code nfpa 70 chapter 5 article 500.

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. 1 it s also 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. 1 fittings and flexible cords used in class i div.

29 cfr 1910 subpart s electrical 1910 307. For definitions of these locations see 1926 449.