3-16
Figure 3-23
Connect the PGND cable when a grounding strip is available
(1) AC power receptacle
(2) Grounding screw
(3) PGND cable
(4) Grounding strip in the equipment room
The fire main and the lightning rod of the building are not good grounding options. The PGND cable of
the device should be connected to the earthing system of the equipment room.
Without a grounding strip
1) If an area with exposed earth is available nearby where a grounding conductor can be buried
Hammer a 0.5 m (1.64 ft.) or longer angle iron or steel tube longer into the earth. Weld the yellow-green
grounding cable to the angle iron or steel tube, and treat the joint for corrosion protection.
Figure 3-24
Connect the PGND cable to a buried grounding conductor
(1) AC power receptacle
(2) Grounding screw
(3) PGND cable
(4) Earth ground
(5) Angle iron
2) If it is not allowed to bury a ground conductor
z
If the device is AC powered, you can ground it through the PE wire of the AC power supply. Make
sure that the PE wire is well grounded in the power distribution room or on the AC transformer side.
