861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
79/214
Installation
21.6
Installing the earthing busbar
Earthing busbars at the switchgear
Earthing busbars at the
intermediate panel
The earthing busbar runs at the rear of the switchgear frames. The units of the earthing
busbars overlap. The earthing busbars are interconnected with two bolts M12 and
a tightening torque of 70 Nm each.
➭ Remove the bolts ② at the joint.
➭ Remove the upright earthing busbar ① .
➭ Put the upright earthing busbar with the bolted joint aside for later reuse.
➭ Push the removed earthing busbar horizontally into the switchgear frame so that it will
overlap with the earthing busbar of the next panel.
➭ At the joint, bolt the earthing busbars of the adjacent panels together using 2x bolts M12
including contact washers, conical spring washers and nuts. To do this, reuse the
disassembled bolted joint. Tightening torque: 70 Nm.
➭ Repeat the assembly operations for all panels until all earthing busbars have been
interconnected.
Fig. 73:
As-delivered condition of panel
to be lined up
①
Upright earthing busbar
②
2x M12 with contact washers,
conical spring washers and nuts
(top view onto the joint)
③
Switchgear frame
④
Short-circuit bridge at
the circuit-breaker housings
Fig. 74:
Interconnecting the earthing busbars
①
Short-circuit bridge at the circuit-breaker housings
②
2x M12 with contact washers, conical spring washers and nuts (top view onto the joint)
③
Earthing busbar connection to the next panel
④
Earthing busbar connection of adjacent panels
⑤
Short-circuit bridge at the panel connection housings
