Cisco 8500 - Power Connection Guidelines for DC-Powered Systems

Power Connection Guidelines for DC-Powered Systems
When connecting DC-input Power Supply Units (PSUs) to the site power source, observe the guidelines
described here.
Statement 1003—DC Power Disconnection
To reduce risk of electric shock or personal injury, disconnect DC power before removing or replacing
components or performing upgrades.
Warning
Statement 1046—Installing or Replacing the Unit
To reduce risk of electric shock, when installing or replacing the unit, the ground connection must always be
made first and disconnected last.
If your unit has modules, secure them with the provided screws.
Warning
Statement 1022—Disconnect Device
To reduce the risk of electric shock and fire, a readily accessible disconnect device must be incorporated in
the fixed wiring.
Warning
Statement 1024—Ground Conductor
This equipment must be grounded. To reduce the risk of electric shock, 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.
Warning
Statement 1033—Safety Extra-Low Voltage (SELV)—IEC 60950/ES1–IEC 62368 DC Power Supply
To reduce the risk of electric shock, connect the unit only to a DC power source that complies with the SELV
requirements in the IEC 60950-based safety standards or the ES1 requirements in the IEC 62368-based safety
standards.
Warning
• All power connection wiring should conform to the rules and regulations prescribed by the National
Electrical Code (NEC), as well as local codes, if any.
• The DC return must remain isolated from the system frame and the chassis (DC-I).
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 stripes indicate that the cable is a ground cable. Since there
is no color code standard for source DC wiring, you must ensure that the power cables are connected to
the DC-input power supply terminal block in the proper + and - polarity.
Hardware Installation Guide for Cisco 8500 Switches
43
Powering on the Switch
Power Connection Guidelines for DC-Powered Systems