Installation and maintenance instructions UniGear type ZS2 UniSafe-36 1YTW571780-012 Rev:E 01-2005 en Page: 15 of 25
2.6 Through Earth Bar
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CAUTION! The encapsulating sheet steel of cubicles may have sharp edges, be careful !
All cubicles have a copper bar for the earth system. The main earth bar is placed at bottom of cubicle
under the earthing switches. Those bars should be bolted together and the station earth system shall be
connected to through earth bar. Conical washers to ABB standard 9ADA334 must also be used
throughout the earth bar connections.
The bare earth bar and the cubicle steelplates must not “just touch” either must be fixed with an air gap or
bolted as connection. Copper bars used for earth connection to the AluZinc plate must be greased “type
E” to avoid galvanic corrosion.
The earth main bars have standard length.
Fig 2.6.1 Through earth bar,assembly.
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