Cisco 7500 Series Replacing Manual page 3

Warning
AC units; disconnect the power at the circuit breaker on DC units. (For a translation of this safety
warning, refer to the section "Translated Safety Warnings" on page 32.)
Warning
power switch, line voltages are present within the power supply even when the power switch is off
and the power cord is connected. For systems without a power switch, line voltages are present
within the power supply when the power cord is connected. (For a translation of this safety warning,
refer to the section "Translated Safety Warnings" on page 32.)
Warning
disconnect the two power supply cords before servicing the unit. (For a translation of this safety
warning, refer to the section "Translated Safety Warnings" on page 32.)
Note
Warning
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. (For a translation of this safety warning, refer to the section
"Translated Safety Warnings" on page 32.)
•
Do not work alone if potentially hazardous conditions exist.
•
Never assume that power is disconnected from a circuit; always check.
•
Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
•
Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
Telephone Wiring Guidelines
Use the following guidelines when working with any equipment that is connected to telephone
wiring or to other network cabling:
•
Never install telephone wiring during a lightning storm.
Warning
activity. (For a translation of this safety warning, refer to the section "Translated Safety Warnings"
on page 32.)
•
Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•
Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface; use caution when installing or modifying telephone lines.
Before working on a chassis or working near power supplies, unplug the power cord on
Do not touch the power supply when the power cord is connected. For systems with a
This unit might have more than one power cord. To reduce the risk of electric shock,
The following warning is for units with DC-input power supplies.
Before performing any of the following procedures, ensure that power is removed from
Do not work on the system or connect or disconnect cables during periods of lightning
Replacing the Chassis Interface (CI) Board in the Cisco 7500 Series Chassis
Installation Prerequisites
3