Table 4-35 Equipment Grounding Specications
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
protective ground for various devices jointly to a general ground bar, and
then to the same protective ground bar in the room together with the
protective ground (PGND) of the device.
2 The PGND of the equipment is shorted to the copper ground bar
provided by the customer. The short-circuiting cable used should be a
yellow-green plastic insulated cable with a copper core and a cross-
sectional area greater than 25 sq. mm (0.039 sq. in.).
3 There are grounding terminals and grounding lugs 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 of no less than 1.6 sq. mm (0.002 sq.
in.).
4 Ensure that all metal components of the cabinet conduct well. No
insulating coating should be sprayed on the connection part of the metal
components.
5 Connect the cabinets in the same row by fastening captive screws and
gaskets on the top of the cabinets. Do not spray any coating into a
rectangular area measuring 30 mm x 50 mm (1.18 in. x 1.97 in.) around
the connection hole for a 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 good electrical contact.
6 When combining cabinets of the same type, short-circuiting cables are
required to connect the ground busbars (if any) of the cabinets. The
cross-sectional area of the short-circuiting cable is 6 sq. mm (0.009 sq.
in.) and is no more than 300 mm (11.8 in.) long. Connect the two ends
of the short-circuiting cable to the ground busbar terminals of
neighboring cabinets and
x them rmly.
4.1.12.3.4 Grounding Specications for Communications Power Supply
Table 4-36 shows the grounding specications for communication power supplies.
Table 4-36 Grounding
specications for communication power supplies
No.
Description
1 The inlet for the AC power cable at the equipment room should be
equipped with a surge protection device (C-level) with a nominal
discharge current no less than 20 kA.
HUAWEI NetEngine 8000 F
Hardware Guide 4 Hardware Installation and Parts Replacement
Issue 05 (2023-03-31) Copyright © Huawei Technologies Co., Ltd. 501
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