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Power Connection Guidelines

This section provides guidelines for connecting the Cisco NCS 4200 Series power supplies to the site power

source.

Warning

This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure

that the switch functional ground lug is connected to earth ground during normal use. Statement 1064

Warning

The plug-socket combination must be accessible at all times because it serves as the main disconnecting

device. Statement 1019

Warning

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

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

• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be

• 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.

• Ensure the DC return is grounded at the source side.

Guidelines for AC-Powered Systems

Basic guidelines for AC-powered systems include the following:

• Each chassis power supply should have its own dedicated branch circuit.

• The circuit breaker should be sized according to the power supply input rating and local or national code

• The AC power receptacles used to plug in the chassis must be the grounding type. The grounding

Cisco NCS 4201 Hardware Installation Guide

with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and

IEC 60950 standards.

sized according to the power supply input rating and local or national code requirements.

requirements.

conductors that connect to the receptacles should connect to protective earth ground at the service

equipment.

Installing the Cisco NCS 4201