This part of IEC 60079, which is a Technical Specification, provides guidance for equipment for use in explosive atmospheres in environments which may include ambient temperatures below -20 °, and additional adverse conditions, including maritime applications. The purpose of this document is to provide recommendations to be considered for the design, manufacture and use of equipment. It is intended that this document be used for equipment operating within the environmental range specified on the certificate for the equipment. NOTE For detailed classification of climate conditions refer to IEC 60721 series and IEC 60068-1. This document is intended to be used in conjunction with the IEC 60079 series and the ISO/IEC 80079 series.