Preventing Electrostatic Discharge Damage - Raisecom ISCOM2826 User Manual

connecting the DC supply to avoid short-circuits and fire hazards.
DC units should be installed in a restricted access area, i.e. an area where access is
authorized only to qualified service and maintenance personnel.
Make sure that the DC supply is electrically isolated from any AC source and that the
installation complies with the local codes.
Before connecting the DC supply wires, ensure that power is removed from the DC circuit.
Locate the circuit breaker of the panel board that services the equipment and switch it to
the OFF position. When connecting the DC supply wires, first connect the ground wire to
the corresponding terminal, then the positive pole and last the negative pole. Switch the
circuit breaker back to the ON position.
A readily accessible disconnect device that is suitably rated and approved should be
incorporated in the building installation.
1.3.

Preventing Electrostatic Discharge Damage

Modules which can be plugged into chassis are sensitive to damage from static electricity.
Conversely, static voltages as high as 35,000V can be generated just by handling plastic
or foam packing material, or by sliding assemblies across plastic and carpets. Not
exercising the proper electrostatic discharge (ESD) precautions can result in intermittent
or complete component failures. To minimize the potential for ESD damage, observe the
following guidelines:
• Always use an ESD-preventive antistatic wrist strap or ankle strap and ensure that it
makes good skin contact.
• When removing or installing a component, make sure the equipment end of your
antistatic strap leash is connected to the ESD connection sockets on the front of
the chassis or to a bare metal surface on the chassis. Avoid contact between the
component and your clothing. The wrist strap only protects the component from
ESD voltages on the body; ESD voltages on your clothing can still cause
component damage.
• Always place a card component-side-up on an antistatic surface, in an antistatic
card rack, or in a static shielding bag. If you are returning the item to the factory,
immediately place it in a static shielding bag.
• Handle Modules by the metal card carrier edges only; Avoid touching the board or
any connector pins.
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