Rev. 13 November 1, 2016
Page | 76i. In Stud Walls: For single or double outlet, use 4 inch square by 1-1/2 inch deep box. Boxes to be
provided with raised covers of depth as required for thickness of wall materials. Back-to-back or
through-wall type boxes shall not be used. Boxes shall be staggered on opposite sides of sound
and fire rated walls.
ii. In Masonry and Poured Concrete Walls: Use 3-3/4” high by 2-1/2” and/or 3-1/2” deep masonry
boxes.
iii. Surface Mounted Wall Outlets: Use 4 “square by 1-1/2” deep box with raised cover in rough areas;
Wiremold box in finished areas.
iv. Suspended Ceiling: Use octagon boxes, depth as required for application; securely fastened to
structure.
v. Outlets installed outdoors or in wet locations: Use cast weatherproof aluminum outlet boxes with cast
aluminum “in use” covers.
c. Floor Boxes: Provide cast iron waterproof, fully adjustable floor boxes, with thread- conduit-entrance ends,
and vertical adjusting rings, gaskets, floor plates and flush screw-on covers. Floor boxes shall be provided
with barrier to separate high and low potential voltages.
d. Poke-through Assemblies: Provide flush mounted, fire-rated, poke-through with separate high and low
potential voltages. Fire rating shall be accomplished with intumescent type material.26 05 36 Cable Trays for Electrical Systems- General
a. Cable trays shall not be used to distribute 120/208 volt or 277/480 volt feeders or branch circuit wiring.
b. Utilize cable tray for horizontal and backbone pathways serving communications cabling. Only welded steel
wire mesh basket type cable trays shall be specified for communications raceway. Acceptable manufacturers
are Cablofil, Flextray or Owner approved equal.
c. Standard size of cabl e t ray s hall be 12” ( w) x 4” (d).
d. Edges of tray s hall be m ade s mooth.
e. Where there are large quantities of low vol tage cabling, such as for sound systems or nurse call systems,
cable t ray shall be us ed. - Installation
a. Cable tray shall be installed in the main corrido rs for distribu tion of telecommunications cabling, nu rse
call cabling, and sound s ystem cabling.
b. Locate cabl e tray so there is adequate room above and to each side of it for access.
Do not install cable tr ay more than 24” a bove an acoustical tile ceiling.
c. Cable tray sha ll ha ve a minimum of 12” of headroom above the tray and 18”
available on the side of the tray for access.
d. Stop cable t ray at fire-rated walls a nd install conduit sleeves through wall.
e. Ground and bond cabl e t ray so it is electrically continuous.
26 10 00 Medium Voltage Electrical Distribution- General
a. Refer to The University of Iowa Design and Construction Services Design Reference
Manual for medium voltage distribution guidelines.