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

Identifying Materials & Equipment

Special Considerations

Two Fine Print Notes provide further explanation of the intended selection and use of equipment in classified areas:

FPN No. 1:  It is important that inspection authorities and users exercise more than ordinary care with regard to installation and maintenance.

FPN No. 3:  Low ambient conditions require special consideration. Explosionproof or dust-ignitionproof equipment may not be suitable for use at temperatures lower than -25°C (-13°F) unless they are identified for low-temperature service. However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified Class I, Division 1 at normal ambient temperature.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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