18. Elektrienergiaga varustamine:
1) häirekeskuse elektrienergiaga varustamine peab toimuma kahest erinevast vooluallikast (põhitoiteallikas ja reservtoiteallikas); ...
If the emergency electrical power source is an accumulator battery and the main electrical power source fails, the accumulator battery must be automatically connected to the emergency electrical switchboard and supply power for an uninterrupted period of three hours to the systems referred to in the first, second and third indents of the second subparagraph.
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