Electrical Safety - Huawei ETP4830-A1 User Manual

ETP4830-A1 Embedded Power
User Manual
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1.2 Electrical Safety

Grounding
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AC and DC Power
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Issue 10 (2017-08-08)
Measure contact point voltage with a multimeter before handling a conductor surface or
terminal. Ensure that the contact point has no voltage or the voltage is within the
specified range.
When installing or removing power cables, ensure that the corresponding circuits are
disconnected to prevent electric arcs or sparks.
If AC input power cables need to be routed from the top, bend the cables in a U shape
outside the cabinet and then route them into the cabinet.
Performing maintenance or replacing components may interrupt power to the loads if
batteries are not connected or the battery reserve is insufficient. Ensure that the switches
for primary loads are in the ON position and do not turn off the battery switch and the
AC input switch at the same time.
Cables stored at subzero temperatures must be stored at room temperature for at least 24
hours before they are laid out.
Perform routine maintenance as described in this manual; replace faulty components at
the earliest.
After maintenance is completed, lock cabinet doors and seal cable holes to prevent
rodents from entering the cabinet.
When installing a device, install the ground cable first. When uninstalling a device,
remove the ground cable last.
Before operating a device, ensure that the device is properly grounded. Ensure that the
ground cable is installed securely (the ground resistance should be less than 0.1 ohm).
Inappropriate grounding may cause device damage and personal injury.
The power system is powered by high-voltage power sources. Direct or indirect contact
(through damp objects) with high-voltage power sources may result in serious injury or
death.
Non-standard and improper operations may result in fire or electric shocks.
Before making electrical connections, turn off the protection switch on the upstream
device to cut the power supply.
Before connecting the AC power supply, ensure that electrical connections are complete.
Before connecting cables to loads or battery cables, check cable and terminal polarities
to prevent reverse connections.
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1 Safety Precautions
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