Equipment required to be identified for Class I locations must meet the provisions of Sections 505. 9 of NFPA 70 and must be tested and listed by an independent laboratory to one or more of the types of protection in ANSI/ISA or ANSI/UL series of standards incorporated in. This section covers the requirements for electric equipment and wiring in locations that are classified depending on the properties of the flammable vapors, liquids or gases, or combustible dusts or fibers that may be present therein and the likelihood that a flammable or combustible concentration. This section sets forth requirements for electric equipment and wiring in locations which are classified depending on the properties of the flammable vapors, liquids or gases, or combustible dusts or fibers which may be present therein and the likelihood that a flammable or combustible. Alternative standard to the classification of hazardous locations requirements of this subchapter. These are locations (buildings, areas within buildings, or areas outside of buildings) where combustible gas is present or may be present. If it. Pepperl+Fuchs provides a specialized portfolio of Ex d (flameproof) and Ex tb (dust protection by enclosure) certified terminal boxes and junction boxes engineered for reliable use in explosion-hazardous areas. These sturdy solutions are certified according to global standards such as ATEX, IECEx.