Section 2(1)(c) in Petroleum and Natural Gas Regulatory Board (Technical Standards and Specifications including Safety Standards for LPG Storage, Handling and Bottling Facilities) Regulations, 2019
(c)"Area Classification" means a method of classifying an area zone wise or group wise based on the presence of explosive gas or vapour - air mixture vis-a-vis the requirement of precautions for construction and use of electrical apparatus;