Siemens 8DB10 Installation And Operating Instructions Manual page 83

Bolting
earthing busbars together
Earthing the panels
864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06
The earthing busbar runs at the rear of the subframes. The units overlap and are
interconnected with two bolts M12 x 45 and a tightening torque of 70 Nm each.
Fig. 83: Bolting earthing busbars together
➭ Remove the left-hand bolt at the joint ② .
➭ Undo the right-hand bolt at the joint ② and fold the earthing busbar section ① to
the left into horizontal position.
➭ Bolt the earthing busbar section ① together with the earthing busbar of the next transport
unit using 2 bolts. Tightening torque: 70 Nm.
➭ Refit the removed bolt at the joint ② and tighten the two bolts at the joint.
Tightening torque: 70 Nm.
➭ Proceed in the same way with all other transport units until all earthing busbar ends of
the switchgear are interconnected.
The cross-sections and materials of the earthing conductors are specified in the DIN/VDE 0101
standard or in the IEC 61936-1 and in the relevant country-specific standards.
➭ Connect the earthing busbar to the substation earth.
Recommendation: In case of panel groups, earth the end panels (M12 bolts) and
every fifth panel at least.
➭ Mount an earthing cable or an earthing bar to the earthing bolt ① of the earthing busbar.
Fig. 84: Earthing bolt of earthing busbar, example: right end panel
Installation
①
Earthign busbar section
folded up
(as-delivered condition)
② Joint
③
Pre-assembled earthing
busbar section
① Earthing bolt
(earthing point)
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