SC Fire Alarm Practice Questions - South Carolina Fire Alarm Contractor Examination Exam

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A listed 24 V fire-alarm power supply float-charges sealed lead-acid batteries. During a primary-power failure, the batteries must supply the system because they are connected in which manner?

In series with the 120 V branch circuit so they boost voltage As the automatic secondary source across the DC bus, isolated from the AC source by the supply's transfer/rectifier arrangement Only to the NAC, never to the SLC or IDC Through a GFCI receptacle in the electrical room

Correct Answer:

As the automatic secondary source across the DC bus, isolated from the AC source by the supply's transfer/rectifier arrangement

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