ICC Residential Electrical Inspectors Practice Exam

What is the minimum length of free conductor required at each outlet or box where it emerges from the raceway?

1. 3 inches

2. 6 inches

3. 12 inches

4. 18 inches

The correct answer is: 6 inches

The minimum length of free conductor required at each outlet or box where it emerges from the raceway is 6 inches. This requirement serves several important purposes in electrical installations. One primary reason for this minimum length is to ensure that there is enough conductor exposed for proper termination. Adequate conductor length makes it easier for electricians to connect wires to devices, switches, and outlets without straining the cables or compromising the integrity of the installation. Additionally, having a set amount of free conductor helps to prevent cold flow and damage to the wire insulation, which can occur if the conductors are pulled too tightly or are not given enough slack during installation. By maintaining this minimum length, it also allows for easier maintenance or future modifications to the electrical system, as technicians will have a bit of additional conductor to work with if they need to make any changes. In summary, the requirement for a minimum of 6 inches of free conductor at outlets or boxes allows for safe, practical, and flexible electrical work. This practice ultimately contributes to both the safety and longevity of the electrical system.