Always follow these electrostatic discharge (ESD) prevention procedures when removing and replacing
modules:
• Ensure that the chassis is electrically connected to ground.
• Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the clip to an
unpainted surface of the chassis frame to channel unwanted ESD voltages safely to ground. To guard
against ESD damage and shocks, the wrist strap and cord must operate effectively.
• If no wrist strap is available, ground yourself by touching a metal part of the chassis.
For the safety of your equipment, periodically check the resistance value of the anti-static strap. It should be
between 1 and 10 megohms (Mohm).
Note
Safety with Electricity
Follow these general guidelines when working on equipment that is powered by electricity:
• Locate the emergency power-off switch in the room in which you are working. If an electrical accident
occurs, you can quickly turn off the power.
• Disconnect all power before doing the following:
• Installing or removing a chassis.
• Working near power supplies.
• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power extension
cables, frayed power cords, and missing safety grounds.
• Do not work alone if hazardous conditions exist.
• Never assume that power is disconnected from a circuit. Always check.
• Never open the enclosure of the internal power supply.
• If an electrical accident occurs, proceed as follows:
• Turn off power to the device.
• Call for help.
• Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate
action.
Follow these guidelines when working with any equipment that is disconnected from a power source but is
still connected to telephone wiring or other network cabling:
• Never install telephone wiring during a lightning storm.
• Never install telephone jacks in wet locations unless the jack is specifically designed for it.
Preparing for Installation
2
Preparing for Installation
Safety with Electricity
