Cisco NCS 4000 Series Hardware Installation Manual page 54

AC-Powered Chassis
AC-Powered Chassis
AC power modules operate in the input range of 180 VAC to 264 VAC, 47 to 63 Hz (nominal input level of
200 to 240 VAC).
Power redundancy requirements vary based on the system configuration (number and type of line cards, etc.).
AC-powered systems are 2N protected. A minimum of two power supplies are required for redundant operation.
Each of the AC power inputs requires a separate dedicated branch circuit. Note that the circuit breaker and
fuse lockout procedures should follow the rules and regulations in the National Electrical Code (NEC) and
any local codes.
The chassis supports two types of AC power cords: International and NEMA (USA).
Figure 37: International AC Power Cord (Cisco PID NCS4K-AC-CBL-IEC)
Figure 38: NEMA AC Power Cord (Cisco PID NCS4K-AC-CBL-NEMA)
Note
Before connecting AC input power cords to the power system, make sure that the power cords are not energized.
DC-Powered Chassis
Use a 6 AWG wire rated 75°C minimum, for DC power modules connection. The system accepts a nominal
input voltage of -48 VDC or -60VDC, with an operational tolerance range of -40.5 to -72 VDC. One dedicated,
commensurately rated DC power source is required for each power module connection. Each power feed shall
be provided with a double pole breaker, rated not more than 60A, with medium delay.
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.
Hardware Installation Guide for the Cisco NCS 4000 Series
52
Installing Power Components