How much free conductor should be left in an electrical box?

When installing electrical wiring, it is important to leave a sufficient amount of free conductor, also known as "free lead," within an electrical box to ensure proper handling and connections during installation and any future maintenance. The standard industry practice dictates that leaving approximately 6 inches of free conductor is optimal. This length provides enough wire for making connections without excessive strain on the wire, ensuring that it can be easily accessed for any work or adjustments needed later on.

Adequate length is crucial as it allows technicians to work without risking damage to the wire, which could occur if the wires are pulled too tight or if connections need to be redone. Having too little wire may result in complications during repairs or modifications, while excessively long wires can create unnecessary clutter and may even lead to potential safety hazards.

Thus, leaving 6 inches of free conductor strikes a balance between usability and safety, making it the correct answer for how much conductor should be left in an electrical box.