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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Marking of Zone equipment is to be marked as shown: From NEC Section 505.9: Electrical equipment of types of protection “e,” “m,” “p,” or “q,” shall be marked Group II. Electrical equipment of types of protection “d,” “ia,” “ib,” “[ia],” or “[ib]” shall be marked Group IIA, IIB, or IIC, or for a specific gas or vapor. Electrical equipment of types of protection “n” shall be marked Group II unless it contains enclosed-break devices, nonincendive components, or energy-limited equipment or circuits, in which case it shall be marked Group IIA, IIB, or IIC, or a specific gas or vapor. Electrical equipment of other types of protection shall be marked Group II unless the type of protection utilized by the equipment requires that it shall be marked Group IIA, IIB, or IIC, or a specific gas or vapor.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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