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The ABB INSTALLATION PRODUCTS 52171 msx is a 4-inch square steel outlet box designed for use with armored and metal clad cable installations. It measures 4 inches square by 2-1/8 inches deep and provides 30.3 cubic inches of interior volume. The box ships with an MS bracket and an armored cable clamp (C-3) already included. Construction is pre-galvanized steel with welded joints for durability in commercial and residential wiring applications. Licensed electricians install this box as part of a rough-in or retrofit wiring project where armored or MC cable is the wiring method.
This outlet box is suited for commercial and residential electrical installations where armored cable or metal clad cable is required by code or by the installer's preference. The 4-inch square format accepts all standard device covers and tile rings, giving the installer flexibility when choosing the final cover or plaster ring. With 11 knockouts in 1/2-inch and 3/4-inch eccentric configurations, it accommodates a range of conduit and cable entry points. The included C-3 armored cable clamp reduces the need for separate hardware on the jobsite.
Designed for use with armored cable and metal clad cable systems. Accepts all standard 4-inch square device covers and tile rings. Compatible with 1/2-inch and 3/4-inch conduit and cable connectors at eccentric knockout locations.
Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize all circuits in the work area before mounting the box or making any wiring connections. Eccentric knockouts should be removed cleanly using a screwdriver and hammer to avoid distorting the box wall. Verify box-fill calculations per NEC Article 314 before pulling conductors to confirm the 30.3 cubic inch capacity is adequate for the intended load.
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