The following information should only be used as a general reference only. For more detailed information concerning hazardous location definitions and equipment installation requirements, refer to the current edition of the National Electrical Code (NEC), Chapter 5 Articles 500 through 516, available from the National Fire Protection Association, or the current version of the Canadian Electrical (CE) Code, Part 1 Section 18, available from the Canadian Standards Association, and the 94/9/EC ATEX Directive from the European Commission.

Combustion Principles

Hazardous Location Definitions:

• North American System – NEC and CE Classifications
• International System – CENELEC and IEC Zone Classifications

Maximum Surface Temperature Class Codes
Equipment Marking Requirements
Methods of Protection

European Union (EU) Requirements – ATEX “New Approach” Directives:

• ATEX Equipment
• Groups and Categories of Apparatus
• Types of Protection of Explosion Protected Apparatus
• Equipment Marking
• ATEX Workplace

Enclosure Types