Metal square electrical boxes provide a conductive enclosure and may be used where mechanical protection, grounding, or bonding is required for electrical wiring. Nonmetallic square electrical boxes are lightweight, nonconductive options commonly used for low-voltage, retrofit, security, networking, and other structured-wiring installations, with features such as one-piece construction, spring-clip mounting, and conduit knockouts.

Choose a square electrical box with enough interior room for the controls, wiring, connectors, and cable bend radius, such as a 4 x 4 box for two-gang back-box applications. For security controls, peripherals, or multiple telephone, CATV, and network components, consider a larger 14.25-square structured wiring enclosure with mounting space and conduit knockouts.

Conduit knockouts let installers route wiring into square electrical boxes using conduit in supported sizes, including combination knockouts for one-half-, three-quarter-, and one-and-one-quarter-inch conduit. Mounting options such as surface mounting, flexible hole patterns, mounting accessories, or spring-clip and screw attachment can help fit new or retrofit installations and secure the box for its application.

Yes, some square electrical boxes are designed to house security controls and peripherals alongside telephone, cable television, and network wiring components. Select a box with enough interior space, suitable knockouts, and a mounting pattern that supports the components in your installation.