Power Supply Considerations; Power Connection Guidelines; Guidelines For Dc-Powered Systems - Cisco NCS 540 Hardware Installation Manual

Safety Warnings
Use the following guidelines when working with any equipment that is disconnected from a power source,
but connected to telephone wiring or network cabling:
• When installing or modifying telephone lines, use caution.
• Never install telephone jacks in wet locations unless the jack is designed to handle such locations.
• Never install telephone wiring during a lightning storm.

Power Supply Considerations

Check the power at your site to ensure that you are receiving clean power (free of spikes and noise). If
necessary, install a power conditioner.

Power Connection Guidelines

This section provides guidelines for connecting the device power supplies to the site power source.
Warning Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground
conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that
suitable grounding is available. Statement 1024
Warning
The plug-socket combination must be accessible always 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 has its own dedicated input power source. The source must comply with the
• Protect the circuit by a dedicated two-pole circuit breaker. Ensure that the circuit breaker is sized according
• The circuit breaker is considered as the disconnect device and is easily accessible.
• If possible, send another person to get medical aid. Otherwise, determine the condition of the victim,
and then call for help.
• Determine whether the person needs rescue pulsing or external cardiac compressions; then take
appropriate action.
safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and IEC 60950
standards.
to the power supply input rating and local or national code requirements.
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Power Supply Considerations
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