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2-2
Cisco Catalyst 4900M Switch Installation Guide
78 -18 35 0- 0 2
Chapter 2 Site Planning
Site Power Requirements
Cooling air is drawn in through the right side and exhausted through the left side of the chassis. Keep
the sides and rear clear of obstructions, including dust and foreign conductive material, and away from
the exhaust ports of other equipment.
Appendix A, “Specifications,” lists the operating and nonoperating environmental site requirements for
the switches. To maintain normal operation and ensure high system availability, maintain an ambient
temperature and EMI-free and continuous power at your site. The environmental ranges listed in
Appendix A are those within which the switch will continue to operate; however, a measurement that
approaches the minimum or maximum of a range indicates a potential problem. You can maintain normal
operation by anticipating and correcting environmental anomalies before they exceed the maximum
operating range.
Site Power Requirements
This section describes the installation site power requirements for the Catalyst 4900M switch. Verify
your site power before you install the switch.
This section consists of the following sections:
• Preinstallation Requirements, page 2-2
• Warnings and Cautions, page 2-2
• EMI Recommendations, page 2-3
• Power Requirements and Heat Dissipation, page 2-3
Preinstallation Requirements
Follow these requirements when preparing your site for the Catalyst 4900M switch installation:
• Connect each switch to separate wiring on a dedicated circuit; provide each switch with its own
branch circuit connection with sufficient overcurrent protection and direct grounding to the branch
circuit.
• To prevent a loss of input power, be sure the total maximum load on each AC circuit is within the
current ratings of the wiring and breakers.
Warnings and Cautions
Follow these precautions when preparing your site for the Catalyst 4900M switch installation:
Caution The total maximum load on each AC or DC -input power circuit must be within the rating of the wiring
and breaker. An overload of input power can result if this requirement is not met.
Warning
Rea d the installatio n inst ructions before connectin g the system to the power source.
S tat eme nt 10 04
Warning
Installation of the equipment must comply with local and national electrical codes.
Statement 1074

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