Grounding Specifications For An Equipment Room - Huawei AP3010DN-AGN Hardware Installation And Maintenance Manual

Huawei AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN
Hardware Installation and Maintenance Guide
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5.3.2 Grounding Specifications for an Equipment Room

The grounding resistance of a comprehensive communication building should be less than or
equal to one ohm. The grounding resistance of an ordinary communication office should be less
than five ohms. The grounding resistance in an area where the earth resistance rate is high should
be less than 10 ohms.
5.3.3 Grounding Specifications for Devices
Table 5-17
Table 5-17 Equipment Grounding Specifications
No.
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Issue 11 (2015-05-18)
Description
The ground cable must be connected securely to the protection ground bar of the
equipment room.
Do not use other equipment as part of the ground cable or electrical connection.
shows the equipment grounding specifications.
Description
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.
The PGND of the equipment is 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 one with copper core, with cross-sectional area greater than 25 sq.
mm (0.039 sq. in.).
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 no less than
1.6 sq. mm (0.002 sq. in.).
Ensure that all metal components of the cabinet conduct well. No insulating coating
should be sprayed on the connection part of the metal components.
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.
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