Huawei DBS3900 Installation Manual page 296

AC/DC Operation Requirements
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Cabling Requirements
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ESD Requirements
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1.4 Radiation Safety
1.4.1 Electromagnetic Field Exposure
This section describes safety precautions related to electromagnetic field exposure.
Strong electromagnetic signals harm human health.
The supply voltage of the power system is hazardous, and direct contact or indirect contact
through damp stuff with the voltage may cause electric shocks.
Irregular and incorrect operations may cause accidents, such as a fire and electric shocks.
Before equipment electrical connection, disconnect the related external-equipment
breaker.
Before connecting the load (electrical equipment) or battery cable, verify that the input
voltage is within the rated voltage range of the equipment.
Before power-on, verify that equipment electrical connections are correct.
If the power cable is prepared at the site, only the insulation layer at the wiring part can
be cut. Otherwise, it may cause short circuit and accidents such as body injury and a fire.
Insulation layer aging or damage may occur when the cable is used in a high-temperature
environment. Leave enough distances between the cable and power busbar, current shunt,
fuse, heat sink and other heating devices.
The signal cable and the strong current cable or high-voltage cable must be bound
separately.
Cables provided by the customer must comply with local cable regulations.
Do not route any cable through the air exhaust vent in the cabinet.
If cables are stored in an ambient temperature below 0° C, move the cables to a room
temperature environment and store the cables for more than 24 hours before installation
To avoid component damage caused by electrostatic on human body, wear ESD gloves
or an ESD wrist strap and properly ground the other end of the ESD wrist strap before
touching a circuit board.
Hold the board edge where no components are installed, and do not touch chips with
hands.
Put removed boards in ESD packing for storage or transportation.
Safety Information