Zone System

(NEC article 505-506/CEC seciton 18)
Sample Marking

Ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are present continuously or for long periods of time under normal operating conditions.

 

Ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are likely to exist under normal operating conditions.

Ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are not likely to exist under normal operating conditions.

Ignitable concentrations of combustible dust or ignitable fibers/flyings are present continuously or for long periods of time under normal operating conditions.

Ignitable concentrations of combustible dust or ignitable fibers/flyings are likely to exist occasionally under normal operating conditions.

Ignitable concentrations of combustible dust or ignitable fibers/flyings are not likely to occur under normal operating conditions.

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