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Article 552 – Park Trailers
552.48 Wiring Methods.
(G) Protected. Metal-clad, Type AC, or nonmetallic-
sheathed cables and electrical nonmetallic tubing
shall be permitted to pass through the centers of the
wide side of 2  4 wood studs. However, they shall
be protected where they pass through 2  2 wood
studs or at other wood studs or frames where the
cable or tubing would be less than 32 mm (1
1
⁄4 in.)
from the inside or outside surface. Steel plates on
each side of the cable or tubing, or a steel tube, with
not less than 1.35 mm (0.053 in.) wall thickness, shall
be installed to protect the cable or tubing. These
plates or tubes shall be securely held in place. Where
nonmetallic-sheathed cables pass through punched,
cut, or drilled slots or holes in metal members, the
cable shall be protected by bushings or grommets
securely fastened in the opening prior to installation
of the cable.
Article 645 – Information Technology
Equipment
645.5 Under Raised Floors.
(D) Under Raised Floors. Power cables, communications
cables, connecting cables, interconnecting cables, and
receptacles associated with the information technology
equipment shall be permitted under a raised floor,
provided the following conditions are met.
(1) The raised floor is of suitable construction, and the
area under the floor is accessible.
(2) The branch-circuit supply conductors to receptacles
or field-wired equipment are in rigid metal conduit,
rigid nonmetallic conduit, intermediate metal con-
duit, electrical metallic tubing, electrical nonmetallic
tubing, metal wireway, nonmetallic wireway, sur-
face metal raceway with metal cover, nonmetallic
surface raceway, flexible metal conduit, liquidtight
flexible metal conduit, or liquidtight flexible non-
metallic conduit, Type MI cable, Type MC cable, or
Type AC cable. These supply conductors shall be
installed in accordance with the requirements of
300.11.
(3) Ventilation in the underfloor area is used for the
information equipment room only. The ventilation