This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations. Statement 1045
Warning
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• Each chassis power supply should have its own dedicated input power source. The source must comply
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized
according to the power supply input rating and local or national code requirements.
• The circuit breaker is considered the disconnect device and should be easily accessible.
• The system ground is the power supply and chassis ground.
• Do not connect the DC return wire to the system frame or to the system grounding equipment.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.
Installing the DC Power Supply
The sections describe how to install a DC power supply in the Cisco NCS 4216:
This equipment is suitable for installation in Network Telecommunications Facilities and locations where the
NEC applies.
Note
This equipment is suitable for installations utilizing the Common Bonding Network (CBN).
Note
The grounding architecture of this product is DC-Isolated (DC-I) for DC-powered products. DC-powered
products have a nominal operating DC voltage of 48 VDC.
Note
Installing the DC Power Supply Module
Perform the following procedure to install the power supply module:
Procedure
Step 1
Ensure that the system (earth) ground connection has been made. For ground connection installation instructions,
see the
Installing the Chassis Ground Connection
section.
Step 2
If necessary, remove the blank power supply filler plate from the chassis power supply bay opening by
loosening the captive installation screws.
Installing the Cisco NCS 4216
34
Installing the Cisco NCS 4216
Guidelines for DC-Powered Systems
