Mencom Hazardous Location Connectors series is designed to meet stringent electrical requirements for protection under Class I Division 2 environments and certified by Underwriters' Laboratories (UL). ‘Class I’ is defined as a hazardous location in which flammable gas or vapor may be present in sufficient quantities to be considered ignitable or explosive. ‘Division 2’ is defined as an area that is not likely to contain dangerous concentrations of flammable substances in closed containers. Common Class I Division 2 hazardous locations include refineries, utility gas plants, coal mines, and liquid-gas storage facilities.