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

Identifying Materials & Equipment

NEC Handbook Commentary

The following additional commentary is found in the NEC Handbook:
"At low ambient temperatures, such as those encountered in the Arctic, explosion pressures increase at very low temperatures. The strengths of materials change, and the explosion pressure within the explosionproof equipment may increase beyond the safe operating strength of the material. In addition, some sealing materials for sealing fittings may become brittle. However, the extent of the hazardous (classified) location may also change under low ambient conditions. The material may be used in a location where the temperature range is so low that no vapors are produced based on the flash point of the material involved."
NOTE: This is an unformatted excerpt from our online fire protection training library.

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