Symbol
Meaning
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Instructions for action
All instructions to be followed within a procedure are
always listed in chronological order.
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List
WARNING
Improper work on electrical systems!
Electric shock can result in death or life-threatening
injuries.
4
Before working on electrical systems, disconnect
them from their voltage supply and secure them
against being switched on again.
4
Work on electrical installations should be carried
out only by qualified personnel in compliance
with local and national electrical regulations and
specifications.