Article 506: Class II and III Zone System

Article 506: Class II and III Zone System

This Code Article provides an alternative to the Division system rules used in Articles 502 and 503.

We first see the Zone system in Art. 505, which provides this alternative system for Class I locations (the combustibles are gases). The Zones are 0, 1, and 2. But if the combustibles are dust or ignitable fibers (Class II or III), the Zones are 20, 21, and 22 (see Zone System for Class II and III Locations), covered by the requirements in Art. 506.

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