This document provides guidance on classifying areas where electrical equipment could provide an ignition source for flammable liquids, gases, or vapors. It discusses:

1) The purpose and responsibility of area classification to identify locations that require special electrical equipment. Industry standards like API RP 500 and NFPA 30 provide definitions and guidelines. 

2) Methods for determining the classification of an area based on the likelihood of a flammable substance being present. Factors like ventilation are considered.

3) Applications of area classification including rules for equipment in classified locations like purging control rooms or areas below grade.

1500 Electrical Classification: Electrical Manual, Section 300, As A Guide For Selecting Types of Equipment Suitable PDF

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