Huawei FusionModule1000A20 Commissioning Manual page 13

FusionModule1000A20 Prefabricated All-in-One
Data Center
Commissioning Guide
●
●
●
●
●
●
●
●
●
●
●
Grounding
●
●
●
●
●
●
●
Issue 03 (2022-12-15)
It is recommended that the three-phase loads be equalized and the neutral-
ground voltage be kept at less than 2 V (ignore this point if no neutral wire is
required) to meet power distribution requirements.
To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits
to telecommunication network voltage (TNV) circuits.
After the installation is complete, ensure that protective cases, insulation
tubes, and other necessary items for all electrical components are in position
to avoid electric shocks.
If the equipment has multiple inputs, disconnect all the inputs before
operating the equipment.
Before maintaining a downstream electrical device supply or power
distribution device, turn off the output switch of its power supply equipment.
During equipment maintenance, attach "Do not switch on" labels near the
upstream and downstream switches or circuit breakers as well as warning
signs to prevent accidental connection. The equipment can be powered on
only after troubleshooting is complete.
Before fault diagnosis and troubleshooting, take the following safety
measures: Disconnect the power supply. Measure the power. Install a ground
cable. Hang warning signs and set up fences.
Check equipment connections periodically, ensuring that all screws are
securely tightened.
Only qualified professionals can replace a damaged cable.
Do not scrawl, damage, or block any labels or nameplates on the equipment.
Promptly replace labels that have worn out.
Do not use solvents such as water, alcohol, or oil to clean electrical
components inside or outside of the equipment.
Ensure that the grounding impedance of the equipment complies with local
electrical standards.
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.
Ensure that the protective ground point of the equipment is reliably
connected to the ground screw of the metal enclosure (ground resistance: ≤
0.1 ohm).
Ensure that the ground resistance of the system for lightning protection is less
than or equal to 10 ohms.
Do not operate the equipment in the absence of a properly installed ground
conductor.
Do not damage the ground conductor.
If high touch current may occur on the equipment, ground the protective
ground terminal on the equipment enclosure before connecting the power
supply; otherwise, electric shock as a result of touch current may occur.
Copyright © Huawei Digital Power Technologies Co., Ltd.
1 Safety Information
6