Journeyman Electrician Exam (NEC)Wiring Methods and MaterialsEasy
A residential electrician is installing a new 120-volt, 15-amp branch circuit for a bedroom. The circuit will use 14 AWG copper conductors. What is the minimum length of free conductor that must be left at each outlet, switch, and junction point for splices or the connection of fixtures or devices?
- A8 inches
- B6 inches
- C12 inches
- D4 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 6 inches
NEC Section 300.14 specifies the minimum length of free conductor that must be left at each outlet, switch, and junction point to allow for proper and safe connections.
Why the other options are wrong
- A. This exceeds the minimum requirement, which is permissible but not the minimum.
- C. This greatly exceeds the minimum requirement, which is permissible but not the minimum.
- D. This is less than the minimum required length.
Free Conductor Length
The minimum length of conductor required to be left in boxes and enclosures for splices or connections to devices and fixtures.
- Ensures adequate slack for connections.
- Prevents straining of conductors.
- Applies to all outlet, switch, and junction boxes.
Memory trick: Six inches of slack for every connection.