Table A-2 Equipment Grounding Specifications
No. Description
1 All communication devices and auxiliary devices (such as mobile base stations,
transmission and switching devices, power supply devices) in the equipment room
should be grounded for protection. Connect all protection grounding for various
devices jointly to a general grounding bar, and then to the same protection grounding
bar in the room together with the protection ground (PGND) of the device.
2 The PGND of the equipment is shorted to the copper protection grounding bar
provided by the user. The short-circuiting cable used should be an alternating yellow
and green plastic insulating one with copper core, with cross-sectional area greater
than 35 sq. mm.
3 There are grounding terminals and grounding flags at the lower part of the front door,
rear door and side panel of the cabinet, connected to the grounding terminals of the
cabinet framework through connection cables with cross-sectional area no less than
1.6 sq. mm.
4 Keep all metal components of the cabinet in good conductibility. No insulating
coating should be sprayed on the connection part of the metal components.
5 Connect the cabinets in the same row closely by fastening captive screws and gaskets
on the top of the cabinets. Do not spray coating into a rectangle area of 30 mm x 50
mm around the connection hole for captive bolt. Measures to prevent rust and
corrosion must be taken for this area. Zinc electroplating with iridescent yellow
chromate conversion coating should be applied to the gasket and nut to ensure
sufficient electric contact.
6 When combining cabinets of the same type, short-circuiting cables are required to
connect the grounding busbars (if any) of the cabinets. The cross-sectional area of
the short-circuiting cable is 6 sq. mm and is less than 300 mm long. Connect the two
ends of the short-circuiting cable respectively to the grounding busbar terminals of
the neighboring cabinets and fix them firmly.
A.4 Grounding Specifications for Communications Power
Supply
This describes the requirements for the grounding of communications power modules in details.
Table A-3 shows the grounding specifications for communication power supply.
Table A-3 Grounding Specifications for Communication Power Supply
No.
Description
1 The AC power supply system of the communication equipment room should adopt
the TN-S power supply mode.
Quidway S5300 Series Ethernet Switches
Quick Start A Equipment Grounding Specifications
Issue 01 (2008-12-26) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
A-3
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