Understanding hazardous area zones is not just a technical need. It is the key to safety that stops major failures in industrial settings. For engineers and site managers, classifying zones like Zone 0, 1, and 2 is essential.
This step helps in choosing equipment, such as explosion-proof cameras. It ensures compliance and protects people and assets.
This guide breaks down exactly what each zone means according to global standards like ATEX and IECEx.
A “zone” classification defines the probability of an explosive atmosphere—composed of flammable gases, vapors, or mists—being present in a location. The system is straightforward: the lower the zone number, the higher the risk.
| Zone | Risk Level | Example Locations |
| Zone 0 | Highest: Constant or long-term risk | Inside storage tanks or vessels |
| Zone 1 | High: Likely to occur in normal operation | Near tank vents, pump seals, or filling points |
| Zone 2 | Low: Unlikely in normal operation | Wider surrounding areas, walkways, control rooms |
This classification is for areas where an explosive gas atmosphere is present continuously or for very long periods. It represents the highest level of risk.
This applies to areas where an explosive gas atmosphere is likely to occur during normal day-to-day operations.
This is the most common zone. An explosive atmosphere is not likely to occur in normal operation, and if it does, it will only exist for a very short period (e.g., due to an accidental leak or equipment failure).
Zone classifications aren’t arbitrary. They are determined through a formal risk assessment conducted by qualified engineers. This assessment analyzes several factors, including:
The zone classification directly dictates the required safety level of any equipment installed in that area. Electrical devices, including lighting and surveillance cameras, must be certified for the specific zone they will operate in.
There is a non-negotiable link between the zone rating and the equipment’s protection level. Using a Zone 2-certified camera in a Zone 1 area, for example, is a serious compliance violation and a major safety risk. Equipment for Zone 0 needs the highest level of protection. In contrast, equipment for Zone 2 can be simpler and cheaper.
Correctly identifying your hazardous area zones is the essential first step. Zone 0 represents a constant risk, Zone 1 a likely risk during normal operations, and Zone 2 an unlikely, short-term risk.
The next critical step is selecting equipment with the corresponding certification. Now that you understand the zones, explore our certified explosion proof cameras designed to deliver uncompromising safety and performance in your specific Zone 1 or Zone 2 environment.
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