What is the minimum length of free conductor required for splices in a 12" × 12" × 4" junction box?

The correct answer is based on the requirements found in electrical codes regarding the length of free conductor that must be provided for splices within junction boxes. Specifically, the minimum free length of conductor ensures that there is enough length for safe and effective manipulation and connection of wires without stressing the connections or causing potential hazards.

For a typical junction box of the specified dimensions (12" × 12" × 4"), the requirement for a minimum of 6 inches of free conductor length allows for adequate space to make splices while adhering to practices that prioritize safety and accessibility during maintenance or modifications. This guideline helps prevent issues such as the conductors being too short, which can make connections difficult or lead to unsafe conditions.

Thus, the recognition that 6 inches is the minimal standard is rooted in ensuring reliable and safe splicing practices within the electrical installation.