Table A-4 AC voltage and frequency
Nominal Voltage
Rated Frequency
110/127/220 (V)
50Hz/60Hz
In common cases, the UPS serves as the backup power supply for network
products. The backup power supply must be the same as the mains in phases, and
the duration for the switchover between the UPS and the mains should be less
than 10 ms. Otherwise, the device might restart or be reset. Each device must
have an independent AC surge protector. The capacity of the surge protector for
the power distribution room must be greater than the sum of the operating
current and fault current on the devices to be powered. The DC power supply
system must be able to safely withstand the maximum load of the device,
regardless of whether the device is in working or standby state. The wire type and
gauge of each outlet of the power distribution panel must be able to withstand
the maximum power load of the devices. The specifications for the AC power
supply voltage of all communications and power supply devices are as follows:
●
Communications devices must be equipped with AC power supply with the
rated voltage ranging from +5% to -10%.
●
Communications power supply devices and key constructions must be
equipped with AC power supply with the rated voltage ranging from +10% to
-15%.
●
The frequency of the AC power current ranges from +4% to -4%, and the
sinusoidal distortion rate of voltage waveform must be 5% or less.
The self-provided generator sets in the communications station must be automatic
in activation, deactivation, and replenishment, be equipped with remote signaling,
remote measurement, and remote control, and provide standard interfaces and
communications protocols.
The power cables used for AC and DC power distribution should comply with the
following specifications:
●
The AC neutral for communications purposes must be a conductive wire that
has the same cross section as the phase cable.
●
The selection of the DC power feeder depends on the long-term load. If the
cross-sectional area is greater than 95 mm
2
, use the rigid busbar. If the short-
term load differs greatly from long-term load, lay out the cables by stages.
●
The DC and AC conducting wires must be fire resistant and the wiring must
comply with the
Class A Fire Resistance Design Norm for High-Rise Civil
Buildings
(GB50045-95). The low-voltage power distribution facilities must
comply with the
Low-Voltage Power Distribution Facilities and Wiring Design
Norm
(GB50054-95)
In addition, the basic AC power supply system should meet the following
requirements:
●
Use voltage regulating or stabilization facilities to restrict the voltage
fluctuation within a reasonable scale if:
–
The communications devices are powered by mains, and the voltage
exceeds the rated voltage by +5% to -10% or the allowed voltage range.
HUAWEI USG6000E Series
Hardware Guide
A Appendix
Issue 08 (2022-04-20)
Copyright © Huawei Technologies Co., Ltd.
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