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Preventing ESD
Electrostatic discharge (ESD) damage occurs when electronic cards or components are mishandled and
can result in complete or intermittent failures. Note the following guidelines before you install or service
the system:
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For safety, periodically check the resistance value of the antistatic strap. The measurement should be
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between 1 and 10 megohms (Mohms).
Installing and Servicing the System
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Disconnecting Power
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Regulatory Compliance and Safety Information for the Cisco 7500 Series Routers
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Always wear an ESD-preventive wrist or ankle strap when handling electronic components. Connect
one end of the strap to an ESD jack or an unpainted metal component on the system (such as a
captive installation screw).
Handle cards by the faceplates and edges only; avoid touching the printed circuit board and
connector pins.
Place any removed component on an antistatic surface or in a static shielding bag.
Avoid contact between the cards and clothing. The wrist strap only protects the card from ESD
voltages on the body; ESD voltages on clothing can still cause damage.
Disconnect all power and external cables before installing the system.
Install the system in compliance with your local and national electrical codes:
United States: National Fire Protection Association (NFPA) 70; United States National
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Electrical Code.
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Canada: Canadian Electrical Code, Part I, CSA C22.1.
Other countries: If local and national electrical codes are not available, refer to IEC 364, Part 1
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through Part 7.
Do not work alone under potentially hazardous conditions.
Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
Do not touch the backplane or midplane with your hand or metal tools.
Remove all jewelry (including rings and chains) or other items that could get caught in the system
or heat up and cause serious burns.
Locate the emergency power-off switch for the room before working with the system.
Turn off the power and disconnect the power from the circuit when working with components that
are not hot-swappable or when working near the system backplane or midplane. If the system does
not have an on/off switch, unplug the power cord.
To completely de-energize the system, disconnect the power connection to all power supplies.
For DC power supplies, 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.
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