2-6
Item
Requirements
Protection
grounding
z
If a grounding strip is available at the site, attach
the yellow-green PGND cable of the AP to the
grounding strip. The PGND cable must have a
cross-section area of at least 6 mm
2
(0.01 in
2
)
and a length not longer than 3 m (9.84 ft).
z
If no grounding strip is available at the site,
hammer a 0.5 m (1.64 ft) or longer angle iron or
steel tube into the earth. The angle iron should be
sized at least 50 × 50 × 5 mm (1.97 × 1.97 × 0.20
in.); the steel tube should have a wall thickness of
at least than 3.5 mm (0.18 in.) and be zinc-plated.
Weld the yellow-green grounding cable to the
angel iron or steel tube and treat the joint for
corrosion protection. With a cross-section area of
at least 6 mm
2
(0.01 in
2
), the grounding cable
should be as short as possible. Do not coil the
cable.
z
Make sure the lightning arresters of all devices
and the peering devices connected to these
devices are well grounded.
Grounding
lead
The grounding lead is a metal conductor connecting
the grounding strip to the grounding grid. The PGND
cable of the device should be attached to the
grounding strip. The grounding lead should not be
longer than 30 m (98.43 ft). A zinc-plated 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.
The grounding strip and the grounding lead should
be jointed using a 35 mm2 yellow-green PGND
cable or directly welded together with the joint
treated for corrosion protection.
AC power
grounding
z
Make sure you use the power cable with a PE
terminal but not the cables with only L and N
wires.
z
It is strictly prohibited to connect the N wire of the
power cable to the protection ground of any other
communications device, and the L and N wires
must be connected correctly.