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Electrical Safety
General Requirements
- Installation, operation, and maintenance must be performed in the sequence specified in the manual. Do not change the structure or installation sequence of the equipment without permission.
- When installing the equipment, use a torque wrench with a proper range to tighten the screws. When using a wrench to tighten the screws, ensure that the wrench does not tilt and the torque error does not exceed 10% of the specified value.
- Before installing or removing power cables, ensure that the switch is turned off.
- If the equipment has multiple inputs, disconnect all the inputs before operating the equipment.
- Before connecting power cables, check that cable labels are correct and cable terminals are insulated.
- A circuit breaker equipped with a residual current device (RCD) is not recommended.
- It is recommended that the three-phase loads be equalized and the neutral-ground voltage be kept at less than 2 V to meet power distribution requirements.
- To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telecommunication network voltage (TNV) circuits.
- A damaged cable must be replaced by the manufacturer or professionals to avoid risks.
- Check equipment connections periodically, ensuring that all screws are securely tightened.
- Do not use water to clean electrical components inside or outside of a cabinet.
- Do not scrawl, damage, or block any labels or nameplates on the equipment. Promptly replace warning labels that have worn out.
Grounding
- For the equipment that needs to be grounded, install the ground cable first when installing the equipment and remove the ground cable last when removing the equipment.
- Ensure that the equipment is connected permanently to the protective ground. Before operating the equipment, check its electrical connection to ensure that it is reliably grounded.
- If a "high electricity leakage" tag is attached on the equipment, ground the protective ground terminal on the equipment enclosure before connecting the AC input power supply; otherwise, electric shock as a result of electricity leakage may occur.
- Do not operate the equipment in the absence of a properly installed ground conductor.
- Do not damage the ground conductor.
Cabling
- When selecting, connecting, and routing cables, follow local safety regulations and rules.
- The flame spread rating of cables should meet the UL 1581 VW-1 or IEC 60332-3-22 (ZB) or higher requirements.
- Do not route cables behind the air intake or exhaust vents of the equipment.
- If a cable is connected to the cabinet from the top, bend the cable in a U shape outside the cabinet and then route it into the cabinet.
- Bind cables of the same type together. When routing cables of different types, ensure that they are at least 30 mm away from each other.
- When routing cables, ensure that a distance of at least 30 mm exists between the cables and heat-generating components or areas. This prevents damage to the insulation layer of the cables.
- When the temperature is low, violent impact or vibration may damage the plastic cable sheathing. To ensure safety, comply with the following requirements:
- Cables can be laid or installed only when the temperature is higher than 0°C. Handle cables with caution, especially at a low temperature.
- Cables stored at subzero temperatures must be stored at room temperature for at least 24 hours before they are laid out.
- Do not perform any improper operations, for example, dropping cables directly from a vehicle. Otherwise, the cable performance may deteriorate due to cable damage, which affects the current-carrying capacity and temperature rise.
ESD
The static electricity generated by human bodies may damage the electrostatic-sensitive components on boards, for example, the large-scale integrated (LSI) circuits.
- Wear ESD gloves or a well-grounded ESD wrist strap when touching the device or handling boards or application-specific integrated circuits (ASICs).
- When holding a board, hold its edge without touching any components. Do not touch the components with your bare hands.
- Package boards with ESD packaging materials before storing or transporting them.
Figure 1-1 Wearing an ESD wrist strap
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