Article 314 C Outlet, Device, Pull and Junction Boxes; Conduit
Bodies; Fittings; and Manholes 314.16(B) Box-Fill Calculations
Article 314 of the National Electrical Code contains
requirements pertaining to the installation and use of all boxes
and conduit bodies used as outlet, device, junction or pull
boxes, depending on their use. As indicated in the title, more
than just boxes are covered in Article 314. This article also
covers manholes and other electric enclosures intended for
personnel entry. Article 314 also includes installation
requirements for fittings used to join raceways and to connect
raceways and cables to boxes and conduit bodies. Prior to the
reorganization of articles in the 2002 edition, Article 314 was
Article 370. Provisions for calculating the minimum-size outlet,
device, or junction box (or conduit body) or the maximum numbers
and sizes of conductors permitted in a box (or conduit body) are
in 314.16. Specifications for box-volume calculations are in
314.16(A) and box-fill calculations