Requirements For Power Supply - Huawei AP8030DN Installation And Maintenance Manual

Huawei AP8030DN & AP8130DN
Hardware Installation and Maintenance Guide
Item
Grounding of the
cabinet

5.2.2 Requirements for Power Supply

Requirements for AC Power Supply
The AC power supply consists of power mains, uninterruptable power supply (UPS), and self-
supplied electric generator. 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 have 3-phase, 5-wire mode or monophase 3-wire mode.
This AC power supply should be 110 V/127 V/220 V/380 V, and the frequency is 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
Issue 02 (2014-12-05)
Requirements
l All the devices including the surge protection device in the cabinet
must be connected in an equipotential manner. The ground cables can
be aggregated to the ground bar or surge protector socket first, and
then the ground bar or surge protector socket is connected to the
ground.
l The resistance tested using a multimeter between the device ground
terminals and ground bar cannot exceed 0.1 ohm.
l The cabinet can be grounded using the protecting earthing (PE) wire
of the electrical network in the building, zinc-coated angle steel, or
main steel bar of the building.
l If the cabinet is grounded using the PE wire of the electrical network,
the grounding status can be checked using a multimeter. If the voltage
between the PE wire and neutral wire is lower than 5 V and the voltage
between the PE wire and live wire is about 220 V, the PE wire is
grounded well. If the tested AC voltages are not within the ranges, the
cabinet must be grounded in other ways.
l The yellow-green ground cable contains multiple copper wires. The
diameter is no smaller than 6 mm
exceed 3 m (9.84 ft.).
l Ground cables cannot be twisted with signal cables.
l Antirust and anticorrosion measures must be taken on the ground
terminals.
l The fiber reinforcing rib can be directly connected to the ground bar
of the cabinet. Before wrapping the reinforcing rib with insulation
tape, cut a 0.5 m (1.64 ft.) segment from the reinforcing rib. Wrap the
reinforcing rib with at least five layers of insulation tape. Keep the
reinforcing rib at least 5 cm (1.969 in.) from the cabinet surface.
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(0.0093 in. ) and the length cannot
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