1. (a) The following are acceptable protection techniques for electric and electronic equipment in hazardous (classified) locations.

   1. (1) Explosion-proof apparatus. This protection technique is permitted for equipment in the Class I, Division 1 and 2 locations for which it is approved.
   2. (2) Dust ignition-proof. This protection technique is permitted for equipment in the Class II, Division 1 and 2 locations for which it is approved.
   3. (3) Dust-tight. This protection technique is permitted for equipment in the Class II, Division 2 and Class III locations for which it is approved.
   4. (4) Purged and pressurized. This protection technique is permitted for equipment in any hazardous (classified) location for which it is approved.
   5. (5) Nonincendive circuit. This protection technique is permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1or 2 locations.
   6. (6) Nonincendive equipment. This protection technique is permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations.
   7. (7) Nonincendive component. This protection technique is permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations.
   8. (8) Oil immersion. This protection technique is permitted for current-interrupting contacts in Class I, Division 2 locations as described in these Orders.
   9. (9) Hermetically sealed. This protection technique is permitted for equipment in Class I, Division 2; Class II, Division 2; and Class III, Division 1 or 2 locations.
   10. (10) Other protection techniques. Any other protection technique that meets Section 2540.3 of these Orders is acceptable in any hazardous (classified) location.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

History

1. Editorial correction of Note filed 11-2-83 (Register 83, No. 45).

2. Editorial correction filed 11-3-83 (Register 83, No. 45).

3. Amendment filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).

4. Amendment of section heading, repealer and new section and amendment of Note filed 5-5-2008; operative 5-5-2008. Submitted to OAL for printing only pursuant to Labor Code 142.3(a)(3) (Register 2008, No. 19).