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Cisco Network Convergence System 4000 Series Hardware Installation Guide
Chapter 4 Installing Power Components
Power Connection Guidelines
Caution
Proper grounding is necessary to avoid damage from lightning and power surges. See the
Supplemental Unit Bonding and Grounding Guidelines” section on page 4-6
for grounding
requirements.
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. For a list of the nominal and acceptable value ranges for source AC power,
see
.
The Cisco NCS 4016 chassis supports two types of AC power cords: International and NEMA (USA).
Figure 4-1
International AC Power Cord (Cisco PID NCS4K-AC-CBL-IEC)
Figure 4-2
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.