Cisco 7000 Installation Instructions Manual page 10

Prerequisites
Safety with Electricity
Follow these basic guidelines when working with any electrical equipment:
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Warning
activity. (For translations of this safety warning, refer to the section "Lightning Activity Warning"
on page 34.)
10 Cisco 7000 and Cisco 7507 Rack-Mount Kit Installation Instructions
Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
Disconnect all power and external cables before installing or removing a chassis.
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.
Do not work on the system or connect or disconnect cables during periods of lightning