4-3
Cisco Network Convergence System 4000 Series Hardware Installation Guide
Chapter 4 Installing Power Components
Power Connection Guidelines
Note
Follow the power and sizing requirements for your site.
Note
The Short Circuit protection Breaker shall not be rated more than 60A.
Power redundancy requirements vary based on the system configuration (number and type of line cards,
etc.). DC-powered systems are N+1 protected.
Power connections to the power tray for each DC power module requires four cables: two source cables
and two return cables.
For DC power cables, we recommend 6 AWG high-strand-count copper wire cables, rated 75°C
minimum. The size of the cables depends on your chassis location from the source power. Follow your
local practices for determining cable size. DC power cables are not available from Cisco, but they are
available from any commercial cable vendor.
You must terminate DC power cables using cable lugs at the power tray end. The appropriate lugs are
provided in the installation kit with 6 AWG cable. Use Panduit part number LCD4-14AF-L or the
equivalent.
Warning
Hazardous voltage or energy may be present on power terminals. Always replace cover when
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
place.
Statement 1086
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Note
Before connecting DC power cables to the power system, make sure that the input power cords are not
energized.
Note
Ensure that there is a readily accessible disconnect device incorporated in the building’s installation
wiring.
Note
Circuit breaker and fuse lockout procedures should follow the rules and regulations in the National
Electrical Code (NEC) and any local codes.
shows the lug type required for DC input cable connections.