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

Classification Basics

Class III Temperatures

From NEC 503.1:

Equipment installed in Class III locations shall be able to function at full rating without developing surface temperatures high enough to cause excessive dehydration or gradual carbonization of accumulated fibers/flyings. Organic material that is carbonized or excessively dry is highly susceptible to spontaneous ignition. The maximum surface temperatures under operating conditions shall not exceed 165°C (329°F) for equipment that is not subject to overloading, and 120°C (248°F) for equipment (such as motors or power transformers) that may be overloaded.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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