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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Testing Criteria

For example, where only samples of the production are tested, either flameproof or explosionproof equipment must withstand 4 times the maximum explosion pressure for the specific group. Alternatively, if 100% of a flameproof product is tested, the enclosures must only withstand 1.5 times the maximum explosion presssure. This testing alternative is not available for explosionproof equipment, but the testing option is available to manufacturers of flameproof equipment.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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