Power Requirements; Power Connection Guidelines For Ac-Powered Systems - Cisco Line Card 4500 E-Series Installation Manual

Chapter 2 Preparing for Installation

Power Requirements

When preparing your site for the switch installation, follow these requirements:
•
•
•
•
•
•
•
•

Power Connection Guidelines for AC-Powered Systems

This section provides the basic guidelines for connecting the Catalyst 4500 E-series switch AC power
supplies to the site power source:
•
•
•
OL-13972-02
In systems configured with two power supplies, connect each of the two power supplies to a separate
input power source. If you fail to do this task, your system might be susceptible to total power failure
due to a fault in the external wiring or a tripped circuit breaker.
To prevent a loss of input power, be sure that the total maximum load on each source circuit is within
the current ratings of the wiring and breakers.
In some systems, you may decide to use an uninterruptible power supply (UPS) to protect against
power failures at your site. Be aware when selecting a UPS that some UPS models that use
ferroresonant technology can become unstable when operating with the Catalyst 4500 E-series
switch power supplies which use power factor correction (PFC). Ferroresonant technology can cause
the output voltage waveform to the switch to become distorted resulting in an undervoltage situation
in the system.
The AC-input power supply has a detachable power cord (except for the 4000 W power supplies)
that allows you to connect each power supply to the site power source. The 4000 W AC-input power
supply power cords are hard-wired to the power supply and cannot be removed.
You can connect the DC-input power supply to the power source with heavy-gauge wiring connected
to a terminal block. The wire gauge size is determined by local electrical codes and restrictions.
If you are using a 200/240 VAC power source in North America, the circuit must be protected by a
two-pole circuit breaker.
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.
Each chassis power supply should have a separate, dedicated branch circuit.
For North America:
The 1000 W power supply requires a 15 A or 20 A circuit.
–
The 1300 W, 1400 W, and 2800 W power supplies require a 20 A circuit.
–
The 4200 W power supply requires a 30 A circuit.
–
The 6000 W power supply requires one or two 20 A circuits.
–
For International:
Circuits should be sized according to local and national codes.
–
Catalyst 4500 E-Series Switches Installation Guide
Power Requirements
2-13