DPU40D-N06A3, DBU20B-N12A3, and
DBU50B-N12A1 Distributed Power System
User Manual
1 Safety Precautions
Issue 04 (2020-02-29)
Copyright © Huawei Technologies Co., Ltd.
4
Symbol Conventions
To ensure personal and equipment safety, observe all the safety instructions marked on the
equipment when installing, operating, and maintaining the equipment.
Symbol
Description
Indicates a part exposed to high voltage. This symbol warns
operators that both direct and indirect contact with the power grid
is fatal. Such areas include hazardous voltage points or protective
power supply covers that may be removed during maintenance.
Warns users of overheating. This symbol is attached to a device
surface that may overheat and cause scalding. It warns users not to
touch the surface during operations or maintenance. Users should
wear heat insulation gloves before operations to prevent scalding.
or
Indicates protection earthing. This symbol is attached next to a
protection ground terminal next to grounded equipment and an
external ground system. An equipment ground cable is connected
to an external ground bar through the protection ground terminal.
Indicates equipotential bonding. This symbol is found with
equipotential terminals inside equipment.
Indicates electrostatic discharge (ESD). This symbol is used in all
electrostatic sensitive areas. Before operating equipment in these
areas, wear ESD gloves or an ESD wrist strap.
Indicates that the equipment is safe to use at altitudes below 2000
m (6561.6 ft.).
Indicates that the equipment is not safe to use in tropical climates.
or
Indicates a fan assembly or moving part. This symbol is
silkscreened on or attached to the panel of a fan assembly,
warning operators to keep away. Do not touch the blades when the
fan is rotating.
or
or
Indicates that users should refer to the instruction. This symbol is
used when the usage of a device port cannot be clearly described.
For example, this symbol can be used in but not limited to the
following scenarios:
1.
For a multi-power device, use it near the power supply to
replace the multi-power supply identifier. The symbol indicates
that the device has multiple power inputs. Therefore, when
powering off the device, you must disconnect all power inputs.
2.
If there are multiple output ports, use the symbol near the
output ports. Connect cables according to the rated power
output and configuration parameter information in the
instruction.
3.
If there are multiple slots, use the symbol near the slot
