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 ...
It’s easier to contain dust than gas, so the requirements for Class II locations (ignitable dust) are not as rigorous as those for Class I locations (ignitable gas). However, a dust-based explosion ...
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