Selection Guide

7OVERVIEW - NEC® REFERENCE
(3) Support fittings fill. Where one or more
luminaire studs or hickeys are present in the
box, a single volume allowance in accordance
 
type of fitting based on the largest conductor
present in the box.
(4) Device or equipment. For each yoke or strap
containing one or more devices or equipment,
a double volume allowance in accordance with
 
strap based on the largest conductor
connected to a device(s) or equipment
supported by that yoke or strap. A device or
utilization equipment wider than a single
50mm (2 in.) device box as described in Table
 
provided for each gang required for mounting.
(5) Equipment grounding conductor. Where one
or more equipment grounding conductors or
equipment bonding jumpers enter a box, a
single volume allowance in accordance with
 
largest equipment grounding conductor or
equipment bonding jumper present in the box.
Where an additional set of equipment
grounding conductors, as permitted by
 
volume allowance shall be made based on the
largest equipment grounding conductor in the
additional set.
(C) Conduit bodies.
(1) General.
conductors or smaller, other than short-radius
 
shall have a cross-sectional area not less than
twice the cross-sectional area of the largest
conduit or tubing to which they can be
attached. The maximum number of
conductors permitted shall be the maximum
number permitted by Table 1 of Chapter 9 for
the conduit or tubing to which it is attached.
(2) With splices, taps or devices. Only those
conduit bodies that are durably and legibly
marked by the manufacturer with their volume
shall be permitted to contain splices, taps or
devices. The maximum number of conductors
shall be calculated in accordance with
 
in a rigid and secure manner.
(3) Short-radius conduit bodies. Conduit bodies
such as capped elbows and service-entrance
 
smaller, and are only intended to enable the
installation of the raceway and the contained
conductors, shall not contain splices, taps or
devices and shall be of sufficient size to
provide free space for all conductors enclosed
in the conduit body.