Cisco Catalyst 3850 Hardware Installation Manual page 87

Power Supply Installation
For the switch commands that display available power budget, see the software configuration guide.
• The airflow for C3850-48XS switches will depend on the power supply and fans installed. Ensure that
the power supplies are inserted correctly to match the corresponding fans. Power supplies with blue
handles correspond to fans with blue handles, and power supplies with red handles correspond to fans
with red handles.
Caution Do not operate the switch with one power-supply module slot empty. For proper chassis cooling, both module
slots must be populated, with either a power supply or a blank module.
Warning
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence
of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician
if you are uncertain that suitable grounding is available.
Statement 1024
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all
cards, faceplates, front covers, and rear covers are in place.
Statement 1029
Warning
Do not reach into a vacant slot or chassis while you install or remove a module. Exposed circuitry could
constitute an energy hazard.
Statement 206
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Warning If a Cisco external power system is not connected to the switch, install the provided connector cover on the
back of the switch.
Statement 386
OL-26779-05
• For power supplies and fans with red handles, airflow is from the front panel to the rear panel (warm
air is 'pulled out of' the switch.)
• For power supplies and fans with blue handles, airflow is from the rear panel to the front panel (cool
air is 'pushed into' the switch.)
Catalyst 3850 Switch Hardware Installation Guide
Installation Guidelines
73