Hazardous Area Classifications

A Hazardous Area Classification (HAC) is intended to identify hazards areas as defined under the electrical code.

General Definition of Hazardous Locations :

Hazardous locations can be defined as areas where flammable liquid, gases or vapours or combustible dusts exist in sufficient quantities to produce an explosion or fire. In hazardous locations, specifically designed equipment and special installation techniques must be used to protect against the explosive and flammable potential of these substances.

The Canadian Electrical Code defines hazardous areas as an area where a potential hazard, i.e. a fire, an explosion, etc. may exist under normal or abnormal conditions because of the presence of flammable gases or vapours, combustible dusts or ignitable fibers. Hazardous locations can also be described as those locations where the electrical equipment might be installed and which by their nature, might present a condition which could become explosive if the elements for ignition are present.

Conditions for Explosions to Occur

In order for an explosion to occur, all three conditions must be present – an ignition source, oxygen and fuel. Static electricity, making and breaking on electrical switches producing sparks, and other heat sources serve as an ignition source.

What do we deliver?

• Hazardous Area Classification Report, as per the CSA C22.1 and NFPA standards, that serves as a design basis for the diagram.
• Hazardous Area Classification Diagram that defines the Hazardous Zones around the equipment. This diagram is required by the Electrical Inspector for approval of your equipment located in hazardous zones.