Installation
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Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
15.8
Interconnecting the earthing busbars
➭
Auxiliary transformer panel only:
The link for an earthing busbar connection to the left is
located in the lateral cable compartment. To connect the earthing busbar, remove the metal
cover of the lateral cable compartment.
➭ Detach the pre-assembled link provided at the joint, and push it through the opening of the
side wall.
➭ Brush oxidized copper surfaces and apply a thin film of mounting paste.
➭ Bolt the link together with the adjacent unit of the earthing busbar (tightening torque:
50 Nm).
➭ Proceed in the same way with the other joints.
15.9
Switchgear earthing
The cross-sections and materials of the earthing conductors are specified in the DIN/VDE 0101
(IEC 61936-1) standard or in the relevant country-specific standards.
The diameter of the earthing cable must be at least 70 mm
2
.
➭ Connect the earthing busbar of the two end panels to the substation earthing system
through one of the earthing connection points ① (bolt M12). In addition, earth every fifth
panel.
➭ Lay the earthing cable ② through the left-hand wiring duct ③ into the cable basement.
➭ Connect the earthing cable to the substation earth.
Fig. 98:
Interconnecting the earthing busbars
①
Earthing connection point
②
Link
③
Earthing busbar
NOTICE
Use of incorrect earthing connection point
Can cause property damage. The earthing connection point for earthing accessories is
not dimensioned for the earthing at the substation earth.
➭ Connect the switchgear to the substation earth exclusively at the earthing connection
points appropriate for this purpose.