Re: Wiring Methods in Hazardous Locations:
If you also include enclosures other than conduits it?s still the dominant protection technique (explosionproof) in Class I, Division 1.
There are several other recognized Class I techniques. (500.7 for ?Divisions? and 505.8 for ?Zones?) A few, such as purging or intrinsic safety, are also recognized Class I, Division 1.