Mandatory:
Isolate the breakel'.
The. position indicctor of th-e closing spring shows "discharged".
Earth both sides of the breaker as specified in the relevant
standards.
Disconnect supply clnd motor voltage. (For the works described in
the chapters
3.2, :1.3,3.4
the voltages are still necessary).
Mind the relevant :;afety regulations.
When opening a po' e column, pump the SF6 gas in a service unit
and evacuate the cl)lumns. Then ventilate the pole columns.
When opening a pole cl)lumn. proceed as follows:
Wear rubber gloves, protective clothing, gas mask and breathing
eouip'11ent during (I!)ening and cleaning.
Remove decompos it i on products immediate ly after havi ng opened the
breaker (pole) or Iny subassembly.
Wipe off decompos~tion products with a piece of cloth or use a
vacuum cleaner.
Do not agitate declmposition products unnecessarily.
Neutral'ize deposits (arc products), adsorption filter and used -
cloth with a 3 %;oda solution for 24 hours, or dispose of as
harmful substance~:,.
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