This refers to a type of electrical wire commonly sold in retail home improvement stores. The designation “10 3” indicates a wire comprised of three conductors, each with a gauge of 10 American Wire Gauge (AWG). An example includes a cable containing a black (hot), a white (neutral), and a red (typically another hot or switch leg) insulated wire, plus a bare ground wire, all encased in a protective outer sheathing. This configuration is often employed for wiring 240-volt circuits such as those required for electric dryers, ovens, or water heaters.
The availability of this type of wire at a major retail outlet provides accessibility for both professional electricians and homeowners undertaking electrical projects. Its common use in high-demand appliance circuits makes it a staple item for residential electrical installations. Historically, advancements in wire insulation and manufacturing have led to safer and more reliable wiring solutions, with readily available options for various electrical needs.