What is the minimum length of free conductor required for each equipment grounding conductor when entering an outlet box?

The minimum length of free conductor required for each equipment grounding conductor when entering an outlet box is established in the National Electrical Code (NEC). The correct length, which is six inches, provides sufficient wire to ensure proper electrical connection and grounding continuity.

Having at least six inches of conductor allows for easier manipulation, connection to grounding terminals, and effective bonding within the outlet box. This length ensures that there is enough wire available to make the necessary connections without twisting or bending the conductor excessively. It also accommodates any potential adjustments if the box configurations change or if maintenance work is performed in the future.

While shorter lengths, like two or four inches, may seem sufficient at a glance, they do not provide the necessary flexibility and ease of connection required for safe and compliant installations.