314.24(C) Clearances for Side-Wiring Entrances.

That the term “side” applies to any wall of a box other than the one opposite the opening.
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That the term “side” applies to any wall of a box other than the one opposite the opening.

Code Change Summary: A new code section on side-wiring entries into a box.

Large devices that require a significant amount of space in a box can make side wiring entries difficult. Entering the side of a box with the wiring method could give very little wiggle room for routing wires to the termination points on the device. Final positioning of the wired device into the box can often pinch the wiring that enters the box if sufficient room has not been provided.

In the 2023 NEC®, new Section 314.24(C) was added to ensure that adequate room is provided for side wiring entries and provides the following two options:

  1. The rearward projection of the device or equipment shall not extend beyond the centerline of the wiring knockout or other entry.
  2. The clearance from the box wall to the installed device or equipment shall not be less than 1⁄2 inch.

The new language in Section 314.24(C) also notes that the term “side” applies to any wall of a box other than the one opposite the opening.

Below is a preview of the NEC®. See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2023 NEC® edition of NFPA 70.

2020 Code Language:

This code section did not exist.

2023 Code Language:

N 314.24(C) Clearances for Side-Wiring Entrances. Where devices or equipment are mounted in boxes having side-wiring entries, the conductors entering from the side shall be protected as covered in (1) or (2), as follows. The term side applies to any wall of a box other than the one opposite to the opening.

(1) The rearward projection of the device or equipment shall not extend beyond the centerline of the wiring knockout or other entry.

(2) The clearance from the box wall to the installed device or equipment shall be not less than 1⁄2 inch.

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314.24(C) Clearances for Side-Wiring Entrances.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Based on new Section 314.24(C), which of the following is true?

A: The term “side” includes the rear of a box.
B: The term “side” does NOT apply to the top of a box.
C: The term “side” applies to any wall of a box other than the one opposite the opening.
D: The term “side” includes the back of a box.
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