Cisco NCS 4009 Installing page 3

Installing Power Components
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.
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.
DC power cable lugs can either be 90-degree or 45-degree. The following figure shows the lug type required
for DC input cable connections.
Figure 3: Typical DC Power Cable Lugs
DC-Powered Chassis
Installing Power Components
3