AP7052DN&AP7152DN
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2017-12-29)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
123
Item
Requirements
they come out/in the equipment room.
Ground the idle lines inside the cable in the equipment room.
Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.
Keep signal cables away from power cables and surge protection
devices.
Collective
ground cable
Use a ground ring or ground bar for the collective ground cable.
Do not use aluminum cables as ground cables. Adopt measures to
prevent electrification corrosion when connecting different metal
parts together.
Use a copper busbar as the collective ground cable with a
cross-sectional area of no less than 120 mm
2
(0.19 in.
2
), or use the
galvanized flat steel of the same resistance. Insulate the collective
ground cable from the reinforcing steel bars of the building.
Grounding
lead-in
The grounding lead-in should be a maximum of 30 m (98.42 ft) long.
Use the galvanized flat steel with cross-sectional area of 40 mm x 4
mm (1.58 in. x 0.158 in.) or 50 mm x 5 mm (1.97 in. x 0.197 in.).
5.2.2 Requirements for Power Supply
5.2.2.1 Requirements for AC Power Supply
An AC power supply system consists of power mains, uninterruptible power supplies (UPSs),
and self-supplied electric generators. In addition to meeting the requirements of the server
load, the AC power supply must have a simple connection line, safe operation, flexible
scheduling, and easy maintenance.
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 5-19 lists the voltage range of the AC power supply for the devices.
Table 5-19
Voltage range of AC power supply
Item
Requirements
AC power capacity to
support the devices
-10% to +5% of the rated voltage
AC power capacity to
support the power modules
-15% to +10% of the rated voltage
