lists the equipment grounding specifications.
Table A-40
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 ground bar and then to the same protection ground bar
in the room together with the protection ground (PGND) of the device.
2
The PGND of the equipment should be shorted to the copper protection ground bar
provided by the user. The short-circuiting cable used should be an alternating
yellow and green plastic insulating cable with a copper core and a 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 areas no
less than 1.6 sq. mm.
4
Ensure that all metal components of the cabinet have good conductibility. Do not
spray any insulating coating on the connection part of the metal components.
5
Securely connect the cabinets in the same row by fastening the captive screws and
gaskets on the top of the cabinets. Do not spray coating onto a rectangle area of 30
mm x 50 mm around the connection hole for captive bolt. You must take measure
to preventing rust and corrosion in 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 any grounding busbars in 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 to the respective ground busbar terminals of the
neighboring cabinets and fix them firmly.
A.4.4 Grounding Specifications for Communications Power
Supply
This section describes the requirements for grounding communications power modules.
lists the grounding specifications for communication power supply.
Table A-41
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.
HUAWEI USG9500 Series
Hardware Guide
A Appendix
Issue 03 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
478
