Hoffman Junction Box Selection Guide
Junction boxes are fundamental components of any electrical installation, providing protected enclosures for wire splices, terminal connections, and conduit transitions. Hoffman junction boxes meet the demanding requirements of industrial, commercial, and outdoor electrical installations with robust construction and appropriate environmental ratings.
Junction Box Materials
Hoffman manufactures junction boxes in carbon steel, stainless steel, and non-metallic materials. Painted carbon steel junction boxes offer durability and economy for general indoor applications. Stainless steel junction boxes provide corrosion resistance for food processing, pharmaceutical, outdoor, and marine environments. Non-metallic junction boxes in fiberglass or polycarbonate offer excellent corrosion resistance and electrical isolation for demanding chemical environments.
NEMA Ratings for Junction Boxes
Junction boxes are available with various NEMA ratings to match installation requirements. NEMA 1 junction boxes are suitable for indoor installations requiring protection against contact with enclosed conductors. NEMA 4 and NEMA 4X junction boxes provide watertight protection for outdoor installations or indoor locations subject to washdown. NEMA 12 junction boxes offer dust-tight and drip-tight protection for industrial environments.
Cover Types and Access
Junction boxes feature either screw covers or hinged covers depending on access requirements. Screw covers provide maximum security and are appropriate where access is infrequent. Hinged covers allow easier access for inspection and maintenance of connections. Both cover types include appropriate gaskets to maintain environmental ratings.
Sizing Junction Boxes
Junction box sizing must accommodate the number and size of conductors being spliced or terminated, following NEC requirements for fill calculations. Additionally, adequate space must be provided for bending conductors without damaging insulation. Hoffman junction boxes are available in a wide range of sizes to meet virtually any application requirement.
Knockouts and Cable Entry
Most junction boxes include knockouts for conduit or cable entry. Standard knockouts accept common conduit sizes while maintaining the enclosure's environmental rating when properly fitted with appropriate connectors. Some models feature factory-drilled holes for specific conduit configurations.
Applications
Junction boxes serve as pull points in long conduit runs, termination points for control wiring, splice locations for power conductors, and mounting enclosures for small devices. Their versatility makes them essential components in manufacturing, utilities, building systems, and process industries.
Contact Gross Automation at (262) 252-1600 for assistance with junction box selection, volume pricing, or specifications for your project requirements.