31
CAUTION:
Hammer a 0.5 m (1.64 ft) or lon
er an
le iron or steel tube into the earth. The an
le iron should have a
dimension no less than 50 × 50 × 5 mm (1.97 × 1.97 × 0.20 in) and the steel tube should have a wall
thickness no less than 3.5 mm (0.14 in) and be zinc-coated.
Figure 41 Ground the switch by burying the grounding conductor into the earth
1
2
3
4
5
6
(1) Grounding screw (2) grounding cable (3) Earth ground
(4) Joint (5) Grounding conductor (6) Switch rear panel
Grounding the switch with the PE wire of an AC power supply
If the switch is AC powered and no grounding strip or area with exposed earth is available at the
installation site, you can ground the switch through the PE wire of the AC power supply, as shown in
Figure 42.
CAUTION:
• Make sure that the AC power supply uses a three-wire cable with a protection wire, and the PE wire of
the AC power supply is well
rounded at the power distribution room or AC power supply transformer
side.
• Make sure that the PE connector on the switch is well connected to the PE wire of the AC power supply.
• If the PE wire of the AC power supply is not
rounded at the power distribution room or AC transformer
side, report the problem and make reconstructions.
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