Huawei S2700 Hardware Installation And Maintenance Manual page 158

S2700&S3700&S5700&S6700 Switch
Hardware Installation and Maintenance Guide
The low-voltage power supply should be 3-phase, 5-wire mode or monophase 3-wire mode.
This AC power supply should be 110 V/220 V, with a frequency of 50 Hz.
The UPS should supply the same power and operate at the same phase as the power mains.
The switching time between the UPS and mains should be less than 10 ms; otherwise, the
networking devices will reboot or reset.
For power distribution capacity in the equipment room, both the working current and fault
current of the devices should be considered. Ensure that independent AC power supplies
protect independent devices. Configure the current-carrying capacity of the protection switch
of the equipment room for more than that of the devices.
Table 13-31
Table 13-31 Voltage range of AC power supply
Item
AC power capacity to
support the devices
AC power capacity to
support the power modules
and important buildings
Frequency of alternating
current
Voltage wave shape sine
distortion
The automated electric generator must have a standard interface that supports
telecommunication protocols, remote telecommunication, monitoring, and control.
AC power cables should meet the following specifications:
l
l
Recommendations for AC Power Supply
The following are recommendations for the AC power supply.
l
l
l
Issue 13 (2017-11-20)
lists the voltage range of the AC power supply for the devices.
AC neutral should have a conductor with the same cross section as the phase line.
AC cables should have non-flammable insulation. The layout of AC cables should
comply with local regulations. Low-voltage power distribution rooms should comply
with local regulations.
If the voltage of the power mains that supply power directly to devices exceeds the rated
voltage by -10% to 5%, or exceeds the voltage range that devices can support, a voltage
regulating device or voltage stabilizing device is required.
If the mains do not supply power for the device directly, or if the mains voltage exceeds
the rated voltage by -15% to 10% or exceeds the input voltage range of the DC power
supply, a voltage regulating device or voltage stabilizing device is required.
A UPS or inverter power supply system is required to provide uninterrupted AC power
to support the telecommunication load.
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Requirements
-10% to +5% of the rated voltage
-15% to +10% of the rated voltage
-4% to +4% of the rated value
Within 5% of the rated voltage
13 Appendix
150