Should the PA-system (Public Address) be connected to a back-up power supply (emergency power supply) or to common 110V/220V line?

01 Oct '19, 18:27

Oct. 1, 2019, 6:27 p.m.
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The public address system shall be connected to the emergency source of power so it is always available even in the case of a blackout.

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01 Oct '19, 18:29

Oct. 1, 2019, 6:29 p.m.
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