Cisco NCS 4000 Series Hardware Installation page 186

DC-Powered Chassis
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Warning
Statement 1030
Before connecting DC power cables to the power system, make sure that the input power cords are not
Note
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.
Figure 86: Typical DC Power Cable Lugs
Warning To avoid shock hazard, be sure to apply shrink wrap tubing around the wire entry area of the lug.
The color coding of source DC power cable leads depends on the color coding of the site DC power source.
Because there is no color code standard for source DC wiring, be sure that power source cables are connected
to the power modules using the proper positive (+) and negative (–) polarity:
Hardware Installation Guide for Cisco NCS 4000 Series
166
Installing Power Components