Assembly of the Earth Bus

Earth bars are screw-fastened between the switchgear panels using connecting bars (Figure 57).

CAUTION
hazard of incorrect assembly Comply with the specifications on treatment of contact surfaces and the tightening torques for busbarScrew Fastenings in the Appendix. Observe the specific standards referring to earthing systems which apply in your country. Failure to follow these instructions can result in injury or equipment damage.

Follow the below steps for assembly of the earth bus:

1. Clean all contact areas of the connecting bar and the appropriate earth bar in the switchgear panels and coat them with lubricant KL (see Treatment of Firmly Screw-Connected Contact Surfaces).

2. Slip the connecting bar (Figure 57,1) into the adjacent panel (3) through the cutout in the panel-supporting structure (2).

3. Screw-fasten (5) connecting bar on both sides to the earth bar (4) in question.

   

   Figure 57
   Mounting the earth bar

   1	Connecting bar
   2	Cutout in panel-supporting structure
   3	Adjacent panel
   4	Earthing bars in the panels
   5	Screw fastening of connecting bar to earthing bars

4. Connect earth bus (Figure 58) to the earthing system of the switchgear building (connecting lines and screw accessories are not included in the scope of supplies).

   

   Figure 58
   Connecting point of switchgear earth bus to building earth