Chapter 2 Preparing for Installation
Power Requirements
Power Connection Guidelines for AC-Powered Systems
This section provides some basic guidelines for connecting the AC power supplies to the site power source:
•Each chassis power supply should have a separate, dedicated branch circuit.
•For North America:
–The 300 W power supply requires a 15 A circuit.
•For International:
–Circuits should be sized according to local and national codes.
•If you are using a 200/240 VAC power source in North America, the circuit must be protected by a
•The source AC outlet must be within 6 feet (1.8 meters) of the system and should be easily accessible.
•The AC power receptacles used to plug in the chassis must be the grounding type. The grounding conductors that connect to the receptacles should connect to protective earth ground at the service equipment.
Power Connection Guidelines for DC-Powered Systems
This section provides the basic guidelines for connecting the Catalyst 4948E switch
•All power connection wiring should conform to the rules and regulations in the National Electrical Code (NEC), as well as any local codes.
•The DC return must remain isolated from the system frame and the chassis
•For DC power cables, we recommend that you use commensurately rated,
The cables and the lugs required to attach the source DC cables to the power supply are not available from Cisco Systems. They are available from any commercial cable vendor.
•The color coding of the source DC power cable leads depends on the color coding of the site DC power source. Typically, green or green and yellow indicate that the cable is a ground cable. Because there is no color code standard for source DC wiring, you must ensure that the power cables are connected to the
•DC power cables must be terminated by cable lugs at the power supply end.
•The circuit breaker is considered to be the disconnect device and should be easily accessible.
•The circuit must be protected by a dedicated
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