H3C Technologies H3C WA2600 Series WLAN Access Points - Manual (Page 12)

3-3
SN Item Requirements
2
Device
protection
ground
(PGND)
z If a grounding strip is available, connect the yellow and green ground cable of the AP
to the grounding strip. If you need to make a grounding cable, the cable should be
with a cross-section area of at least 6 mm
2 (0.24 in 2 ) and a length of no longer than 3
m (9.84 ft).
z If no grounding strip is available, bury a piece of angle steel/steel tube at least 0.5 m
(1.64 ft) long in the earth to serve as the earthing conductor. In the case of a piece of
angle steel, the size should be at least 50 mm × 50 mm × 5 mm (1.97 in. × 1.97 in. ×
0.20 in.); in the case of a piece of steel tube, it must be zinc-plated and have a wall
thickness of at least 3.5 mm (0.14 in.). Weld the yellow and green ground cable of the
AP onto the earthing conductor and use anti-erosion treatment on the welding joint.
The grounding cable should be as short as possible and must not be coiled.
z Ensure that the grounding points of all the lightning arresters of the AP and the peer
device of the AP are well grounded.
3
Grounding
lead-in
A grounding lead-in is a metal conductor connecting a grounding net and a grounding
strip. The grounding cable of the AP should be connected to the grounding strip. The
grounding lead-in must be 30 m (98.43 ft) or shorter. A piece of zinc-coated flat steel with
a cross-section area of 40 × 4 mm (1.57 × 0.16 in) or 50 × 5 mm (1.97 × 0.20 in) is
recommended. Connect the grounding strip and the grounding lead-in of the AP through
the yellow and green ground cable with an area of 35 mm
2
(1.38 in.), or weld them
directly. Use anti-erosion treatment on the welding joint.
4
Power
grounding
(AC)
z Use a power cord with a protective earth (PE). Do not use a power cord with only an L
line and an N line.
z The neutral line of the power cord should not be connected with the PGND of other
communications equipment. The L and N lines cannot be connected
5
Lightning
arrester
In plain areas, the protection angle of the lightning rod should be less than 45 degrees. In
mountainous areas or lightning areas, the protection angle should be less than 30
degrees. The lightning protection grounding (for example, the grounding of the lightning
rod) should be connected to the earthing conductor of the equipment room.
6 Feeder
z The antenna support is already prepared according to the design requirements.
z A feeder lightning rod is already installed and grounded according to the design
requirements.
7
Outdoor
lightning
arrester
Power lightning arrester, port lightning protector, and feeder lightning arrester are
recommended for outdoor installations. The power lightning arrester and the feeder
lightning arrester should be near the AP, and the network interface lightning arrester
should be near the peer device of the AP. The network interface lightning arrester should
be installed where the network cable is just led out of the room.
8
Network
cable Use a shielded twisted pair cables for an AP used outdoors. Ensure that the devices at
the two ends of the cable are well grounded.
After you have completed the preparations, you can start installing the AP.