A Class I, Division 1 Location (C1D1) is one “in which ignitable concentrations of flammable gases or vapors may exist under normal operating conditions; or in which ignitable concentrations of such gases or vapors may frequently exist because of repair or maintenance operations or because of leakage; or in which …

What is C1D1 certification?

A Class I, Division 1 Location (C1D1) is one “in which ignitable concentrations of flammable gases or vapors may exist under normal operating conditions; or in which ignitable concentrations of such gases or vapors may frequently exist because of repair or maintenance operations or because of leakage; or in which …

What is C1D1 vs C1D2?

For example, C1D1 represents hazardous gas that’s present during normal working conditions, while C1D2 is hazardous gases that are present but remain in a container or system under normal circumstances.