Item Requirements
Grounding of DC
power
distribution
l Connect the DC working ground (positive pole of the -48 V DC power
supply or the negative pole of the 24 V DC power supply) with the
indoor collective ground cable nearby. The total ground cable should
meet the maximum load of the equipment.
l The power equipment must have the DC working ground cable, which
can connect the power equipment to the collective ground cable of the
telecommunication site (or the protection ground bar of the equipment
room).
Equipotential
connection
l Ground the devices and auxiliary devices in the room such as mobile
base station, transmission, switching equipment, power supply
equipment, and cable distribution frame properly. Connect all PGND
cables to the collective protection ground bar. Connect all PGND
cables in one equipment room to one protection ground bar.
l Apply joint grounding to the working ground and protection ground
of devices, which means the two share one grounding network.
l The cable tray, rack or shell, metal ventilation pipe, metal door or
window of the equipment should be grounded for protection.
General
requirements for
grounding
l Do not connect the neutral line of the AC power cable with the
protection ground of any telecom equipment in the equipment room.
l Do not install the fuse or switch on the ground cable.
l All ground cables should be as short as possible, and arranged directly.
Grounding
resistance
l The grounding resistance must be lower than 1 ohm.
l The upper end of the grounding body should be at least 0.7 m (2.30
ft) over the ground. In cold areas, bury the grounding body below the
frozen ground.
l Measure the grounding resistance periodically to ensure effective
grounding.
Routing of signal
cable
l Do not arrange the signal cables overhead in the equipment room. All
signal cables must be led into the site underground.
l Use the cables with metal jacket or place them into the metal pipe if
they come out/in the equipment room.
l Ground the idle lines inside the cable in the equipment room.
l Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.
l Keep signal cables away from power cables and surge protection
devices.
Huawei AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN
Hardware Installation and Maintenance Guide 5 Appendix
Issue 11 (2015-05-18) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
87
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