Concealed boxes are typically manufactured from metal or PVC. Metal boxes are often made from ISI-grade galvanized steel or GPSP (Galvanized Plain Skin Pass) steel, with thicknesses ranging from 0.8mm (Eco Series) to 1.0mm (Elite Series) for enhanced corrosion resistance and durability . PVC boxes are made from 100% virgin PVC, offering resistance to moisture, UV exposure, and corrosive environments . Metal boxes are grounded and bonded to maintain electrical continuity, while PVC boxes are non-conductive and lightweight .
The internal volume of a concealed box is critical for safety and code compliance. Standard wall boxes are sized according to the number of devices (gangs) and depth requirements. For example, a single-gang metal box typically provides 14–20 in³, with deeper versions recommended for GFCIs, dimmers, or smart switches . Multi-gang boxes increase in width with each additional device, and ceiling or junction boxes are designed based on structural load and fixture type rather than gang count .
Concealed boxes are engineered to fit popular modular systems such as Anchor Roma Base, GM, Vinay, Legrand, and Schneider. They are manufactured from a single piece without welding to ensure structural integrity and long-term performance . PVC boxes are matched to specific applications like junction, switch, or utility enclosures and comply with NEMA ratings for environmental protection .
Concealed electrical boxes must comply with NEC Article 314 and UL 514C standards. Key requirements include:
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