FAQ

64
continued from page 62
Material taken from the National Electric Code
®
is reprinted with permission
from NFPA 70
®
, 2023 edition. National Electrical Code
®
, Copyright 2022,
National Fire Protection Association, Quincy, MA. All rights reserved.
NEC
®
Text
(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 13 mm (1/2 in.).
Expert Analysis
A new sentence has been added at 314.24(B) to clarify
that conductor sizes 12 or 10 AWG, entering from the
center portion of the rear of a box opposite to the
equipment, the minimum clearance shall be increased
to 1/2 in.
In addition, a new subsection has been added to
314.24(C) to address the protection techniques where
devices or equipment are mounted in boxes having
side-wiring entries. The protection techniques include
the rearward projection of the device or equipment shall
not extend beyond the centerline of the wiring knockout
or other entry, or the clearance from the box wall to
the installed device or equipment shall not be less
than 1/2 in. The term side applies to any wall of a box
other than the one opposite to the opening.