Explosion-proof Class C distribution box dimensions and specifications

Class C explosion-proof distribution boxes are designed for hazardous areas, typically constructed from stainless steel or aluminum, with flameproof enclosures, flexible mounting, and customizable cable entry options.

Key Specifications

• Material: Commonly 304 or 316L stainless steel or aluminum, providing corrosion resistance and durability in harsh environments .
• Flameproof Rating: Enclosures meet Ex d IIC T6…T4 standards for gas groups and Ex tb IIIC T80°C…T130°C for dust groups, suitable for Class I, Division 1 & 2, Groups C and D hazardous areas .
• Ingress Protection: Many models provide IP66/IP67 ratings, ensuring protection against dust and water ingress .
• Mounting: Boxes can be freestanding, wall-mounted, or combined modularly. Detachable mounting feet and optional hinges allow flexible installation and easy maintenance .
• Internal Features: Internal mounting plates are machined for field installation of components such as circuit breakers, disconnect switches, and terminal blocks. Internal grounding lugs are provided for safety .
• Cable Entry: Conduit entries can be drilled and tapped according to site requirements. Optional cable glands (e.g., DQM-II or DQM-III) are recommended for flameproof integrity .
• Cover and Bolts: Style C boxes often feature aluminum or stainless steel covers, captive triple-lead quick-release bolts, and neoprene gaskets for watertight sealing .

Dimensions

• Variety of Sizes: Class C distribution boxes come in multiple sizes to accommodate different electrical loads and component arrangements. For example, Crouse-Hinds Style C enclosures provide top and bottom openings of 1–2 inches and side openings as required, with square corners maximizing interior space .
• Customizable Layouts: Boxes can be combined or stacked to save space, and internal mounting plates can be adjusted to fit specific equipment .
• Typical Depth and Width: While exact dimensions vary by manufacturer and model, standard enclosures range from small junction boxes (~200x200x150 mm) to large distribution panels (>800x600x300 mm), with custom sizes available on request .

Additional Features

• Hinged Covers: Optional stainless steel hinges allow easy access for inspection and maintenance .
• Seismic and Corrosion Resistance: Certain models, like the Seiscorex ATEX enclosures, are designed for seismic zones and feature anti-corrosion finishes .
• Component Integration: Voltmeters, ammeters, LED indicators, and control switches can be mounted directly on the cover panel for space efficiency .

Summary

Class C explosion-proof distribution boxes are robust, modular, and highly customizable, designed to meet stringent safety standards in hazardous environments. They offer flexible mounting, multiple material options, flameproof ratings, and configurable cable entries, with dimensions ranging from compact junction boxes to large distribution panels, ensuring suitability for a wide range of industrial applications .