Rev. 13 November 1, 2016
Page | 74stripe) shall be installed in the panel feeder and all branch ci rcuits. A green grounding conductor shall also
be installed to bond the panel enclosure.
i. Sensitive electronic and imaging equipment of ten require a very “clean” grounding connection. Provide a
dedi cated grounding c onductor to main electrical service grou nding point and provide f or m onitoring of
ground noise p rior to connection o f equipment.
j. Operating Rooms and similar rooms with an isol ated power source (IPS) shall have isolated po wer
systems with equi-potential grounding. This includes an isolated power pa nel with isolation transformer
and monitoring/indication, receptacles, and low leakage conductors. Refer to NEC 517.- Materials
a. Ground rods shall be 10’-0” long x ¾” di ameter, c opper or c opper clad steel.
b. All grounding c onductors, ground bars, etc. shall be coppe r.
c. Ground ba rs in standard electrical rooms shall be a mini mum of ¼” thick, 4” tall, and 24” long.
d. Ground bars in the main electrical r ooms sha ll be a minimum of ¼” thick, 4” tall, and 48” long.
e. Ground bars in telecommunications rooms shall be a minimum of ¼” thick, 4” tall,
10” long. Refer to the Telecommunications Design Reference Manual, prepared by Communications
Technology Services, f or more infor mation on grounding for telecommunications equipment. - Installation
a. A green grounding conductor sha ll be i nstalled throughout the entire new or modified portion of the
electrical dist ribution system. Relying on the raceway for the sole source of grounding is not
acceptable exc ept in remaining panels which will be reus ed a s noted a bove.
b. A separate grounding bar sha ll be installed in each electrical room and telecommunications room,
connected to the main electrical room grounding ba r with a #4 /0 g rounding conductor (in con duit).
26 05 33 Raceway and Boxes for Electrical Systems- Conduit
a. General
i. Minimum size conduit for power, fire alarm, sound, control, and lighting conduits shall be ¾”.
Minimum size conduit for telecommunications systems, including nurse call, shall be 1” (see
Communications Technology section of this standard).
ii. Conduits for power feeders over 2” in size shall be galvanized rigid steel or intermediate metal
conduit.
iii. Conduits over 2” in size shall have a grounding bushing.
iv. Conduit fill – Branch circuit fill shall be limited to 3 grounded, 3 ungrounded and one equipment
grounding conductor. Any changes shall only be permitted with written approval from both Capital
Management and Engineering Services.
v. All conduits shall be Allied EZ-Pull True Color Electrical Metallic Tubing (EMT/Ridged) as follows:
Normal power – Blue; Critical power – Yellow; Life Safety power – Green; Equipment emergency
power – Orange; Fire Alarm – Red; Communications – Black; Fire doors – Brown; Building
Controls – White.
b. Type s of C onduit
NOTE: All rigid conduit shall be identified at each connector and coupling according to 26 05 33 a iv.
i. Electrical Metal Tubing (EMT): Use for installations in stud walls, masonry walls, above suspended
ceilings and where exposed. Size limited to 2 inches and smaller for power feeders, greater than 2
inches is acceptable for communications conduits. Fittings shall be compression type, malleable iron
or steel, water and concrete type. Set screw or indenter type fittings shall not be used.