Establishing and Testing the Electrical Connection

Distance between busbar elements to enable proper connection	The distance between the conductor ends of two cast resin busbar elements (junction) should be 30 +/- 5 mm. The cast resin busbar elements to be connected must be aligned and level.
The ends of the elements must be cleaned and dried	Clean the conductor ends with a polishing fleece and dry them with an industrial drier before inserting the junction block if: The elements have been stored for long. The conductor-end protective packing is damaged. The conductors have become contaminated, wet, or corroded. Check the insulation resistance of each element. The insulation resistance must be ≥ 1 MΩ.

Inserting the junction block between two elements	Insert the junction block between the copper or aluminum conductors from above or below. Align it such that it extends equally on all sides. If necessary, gently knock the junction block into place using a rubber hammer.
Tightening the connections between the junction block and the elements	When the junction block is aligned, tighten the connecting bolt. Tighten to 54 N.m using a torque wrench for junction blocks with bolt size 17 mm or to 84 N.m for junction blocks with bolt size 19 mm.

After connecting a subsection (maximum of 6 elements), carry out the following tests:

Insulation testing: Using a megohmmeter, check the insulation resistance between each phase or neutral¹ and earth (the casing, if it is connected to earth). According to IEC 60364-6 (and 61.3.3) standard, the insulation values must be:
- Rated voltage < 500 V Utest DC = 500 V Ri ≥ 1 MΩ.
- Rated voltage > 500 V Utest DC = 1000 V Ri ≥ 1 MΩ.
PE protective circuit equipotential (According to ref: IEC 61439-1): Using an ohmmeter, check the PE protective circuit continuity by visual inspection and random continuity testing.

¹: No neutral insulation if the neutral is connected to or used as the earth.