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5
Regulatory Compliance and Safety Information for the Cisco MDS 9000 Family
78-17429-05
Site Preparation
Power Considerations
AC and DC power supplies, and an optional redundant (second) power supply, are available for most
systems. Be careful when connecting systems to the supply circuit so that wiring is not overloaded.
Note Refer to your hardware installation guide for AC and DC power specifications and for redundant power
supply availability.
Ensure that circuits are sized according to local and national codes and that the site power meets the
power requirements as specified in the hardware installation guide. If available, you can use an
uninterruptible power supply (UPS) to protect against power failures.
Caution Avoid UPS types that use ferroresonant technology. These UPS types can become unstable with systems
like the Cisco MDS 9000 Family, which can have substantial current draw fluctuations because of
fluctuating data traffic patterns.
Caution To prevent loss of input power, ensure the total maximum loads on the circuits supplying power to the
switch are within the current ratings for the wiring and breakers.
AC Power
The system is designed for connection to TN power systems. A TN power system is a power distribution
system with one point connected directly to earth (ground). The exposed conductive parts of the
installation are connected to that point by protective earth conductors.
Ensure that the plug-socket combination is accessible at all times, because it serves as the main
disconnecting device.
DC Power
Follow these guidelines for DC power supplies:
• Connect DC-input power supplies only to a DC power source that complies with the safety extra-low
voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and IEC 60950 standards.
• Ensure that there is a readily accessible disconnect device incorporated in the building's installation
wiring.
•
Ensure that power is removed from the DC circuit before installing or removing power supplies.
Tape the switch handle of the DC circuit breaker in the off position.
• Use only copper conductors to connect to a DC terminal block.
• Use approved wiring terminations, such as closed-loop or spade-type with upturned lugs, when
stranded wiring is required. These terminations should be the appropriate size for the wires and
should clamp both the insulation and the conductor.
• Ensure that no exposed portion of the DC-input power source wire extends from the terminal block
plug. An exposed wire can conduct a harmful level of electricity.