Cisco 4490 - Manual (Page 38)

Chapter 2 Preparing for Installation
Safety Warnings
2-4
Cisco Global Site Selector 4490 Hardware Installation Guide
78-15755-02
Warning There is the danger of explosion if the battery is replaced incorrectly. Replace
the battery only with the same or equivalent type recommended by the
manufacturer. Dispose of used batteries according to the manufacturer’s
instructions.
Warning This unit might have more than one power supply connection. All connections
must be removed to de-energize the unit.
Warning Blank faceplates and cover panels serve three important functions: they
prevent exposure to hazardous voltages and currents inside the chassis; they
contain electromagnetic interference (EMI) that might disrupt other equipment;
and they direct the flow of cooling air through the chassis. Do not operate the
system unless all cards, faceplates, front covers, and rear covers are in place.
Warning Never attempt to lift the chassis with the handles on the power supplies, fan
trays, or the switching modules. These handles are not designed to support the
weight of the chassis. Using them to lift or support the chassis can result in
severe damage to the equipment and serious bodily injury.
Warning Before connecting or disconnecting ground or power wires to the chassis,
ensure that power is removed from the DC circuit. To ensure that all power is
OFF, locate the circuit breaker on the panel board that services the DC circuit,
switch the circuit breaker to the OFF position, and tape the switch handle of the
circuit breaker in the OFF position.
Warning Connect the unit only to DC power source that complies with the safety
extra-low voltage (SELV) requirements in IEC 60950 based safety standards.
Warning A readily accessible two-poled disconnect device must be incorporated in the
fixed wiring.