Hardware Technical Reference Manual
I Standard metal rack • Bolt each rack securely to the floor and connect a dedicated ground wire
between the frame and the ground bus bar.
• If rack-mounted equipment obtains safety ground from the metal rack,
ensure that a good electrical connection is made between the rack and
the cabinet metalwork. Use “star” washers to obtain a solid electrical
connection to painted cabinets
• Route any power cables contained within the rack away from any UTP
patch cabling
Note: Fiber optic cabling can be routed anywhere within the rack because it
is not susceptible to electrical emissions.
J AC Mains metal conduit • Metal conduit that contains power wiring must have three wires for each
dedicated circuit: Ground (bare), Neutral (White), Hot or Line (Black). Do
not use the conduit as the ground.
K Telecoms main ground • Main ground connector must be 6 AWG stranded, copper, green-colored
cable connected to the main building ground.
Caution: A proper ground is required for proper equipment operation and
safety. A power quality engineer can provide advice on new and existing
installations. Refer to row G in this table for additional information.
L Rack grounds • Use separate wires to ground each rack to the ground bus bar
M Equipment grounds • Use separate wires to ground each piece of equipment to the ground bus
bar. If a ground stud is provided on the back of the unit, connect it to the
ground bus bar with a dedicated ground wire (use the gauge specified by
the manufacturer).
N Patch cable • Interconnect Ethernet equipment supporting 100 Mbps transmission with
CAT 5 UTP patch cable. Label the cables and route them neatly through
the channels provided in the metal rack.
Caution: Do not use voice grade twisted pair interconnect patch cable wired
to standard voice grade punch-down blocks on an IDE.
O Metal rack interconnect • The metal brackets used to connect the racks provide mechanical
connection only. Use a dedicated ground wire to ground each rack
separately to the ground bus bar.
P Cable tray ground • Connect the metal racks that house the Ethernet cable to the ground bus
bar to provide an effective shield against potential noise sources such as
power lines and florescent lights.
Q Cable tray • The tray should contain Ethernet cables only. Do not mix power cables
with Ethernet cables
Table 87: Equipment Room Cabling Guidelines (continued)
Connection Guidelines
Page 3 of 3
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