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Marking of Equipment

Electrical equipment approved or listed for use in North America will bear the following information:

  1. The class or group of the hazardous location.

  2. The temperature code (T1-T6) or the maximum surface temperature of the equipment.
Example: Class 1, Group D hazardous location T3 (Division 1 is implied)

Electrical equipment approved to the IEC standards will bear the following markings:

  1. The letter "E", indicating that it is suitable for use in an explosive atmosphere

  2. The letter indicating the type of protection used (e.g., "d" for explosion-proof)

  3. 3) The group for which the equipment is approved

  4. The temperature code (T1-T6) or the maximum surface temperature of the equipment

Example: Ex d IIA T3 (Zone 1 is implied)
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