Electrical Connection Of The Prime Conductor - Siemens 3AH3 Operating Instructions Manual

Fig. 66 Cleaning the contact areas
Preparing contact areas
Siemens Parts
9229 9860 176 0E
2013-08-22

Electrical connection of the prime conductor

DANGER
High-voltage – danger to life
Test the vacuum circuit-breaker in the switchbay with high-voltage applied only
after faultless functioning has been ascertained (see "Commissioning" on
page 49).
Note
Grease the busbars with contact grease prior to mounting.
The busbars can be purchased from the Siemens Service Center.
Busbar connection
Adjust the busbars in such a way that, before fastening, they lie flat easily and fit the
holes on the contact areas of the vacuum circuit-breaker.
Note
Clean silver spray-plated and copper spray-plated contact areas with a cloth, do
not brush.
Different connection materials (AI/CU) must not be cleaned with the same clean-
ing tools.
Silver-plated parts must not be bolted to aluminium bars/rails.
Use a steel brush to carefully brush the contact areas (cross-wise) of the busbars
until they are metallically bright and wipe off any residue using a clean cloth.
After cleaning, very lightly grease the bright contact areas with acid-free Vaseline
(e. g. Shell-Vaseline 8420) and screw together immediately.
Fig. 67 Cleaning the contact areas of the busbars
Mounting
47