Zone 1 classified location
An area where ignitable concentrations of flammable gases, vapors or liquids are likely to exist under normal operating conditions. As a guide for Zone 1, this can be defined as 10–1000 hours/year or 0.1–10% of the time.
For Canada, industries follow the Canadian Electrical (CE) Code published by the Canadian Standards Association. It sets the standards for the installation and maintenance of electrical equipment in Canada.
For the European Union (EU), industries follow the ATEX Directive that publishes standards to ensure electrical equipment installed in areas with an explosion atmosphere present minimal risk to employees on-site.
For industries that operate internationally, the International Electrotechnical Commission (IEC) publishes the standards that classify electrical systems for specific locations, as well as category and test equipment for hazardous locations (denoted by an Ex). This is how the acronym IECEx is derived.
Since ATEX certification only applies for facilities based in the European Union (EU), many companies prefer the IECEx certification that is recognized worldwide.
Division 1 Rated Hazardous Computers
The Class, Division rating system is defined in the National Electric Code (NEC), NFPA 70 as published by the National Fire Protection Association. NFPA published the NEC classification system to provide international companies with compatible rating system to the IEC classification system.
Hazardous computers rated for Division 1 (Div 1/C1D1) environments are designed to work in areas where ignitable concentrations of flammable gases, vapors or liquids are likely to exist under normal operating conditions.
Industries that operate in rugged and hazardous environments within North America typically require technology that is rated for Division 1 applications, such as offshore and natural gas, petrochemical, and in some cases, pharmaceutical, food, paint and chemical.
The Canadian, European and International code is indicated by the Zone 1 marking. You can view Daisy products here that meet Zone 1 standards.