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

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Why are dual-beam or quad-beam photoelectric detectors preferred over single-beam units for outdoor perimeter protection?

Multiple stacked beams reduce false alarms from birds, leaves, or small animals breaking only one beam They operate at 120 volts instead of 12 volts They do not require alignment They replace the need for a control panel

Correct Answer:

Multiple stacked beams reduce false alarms from birds, leaves, or small animals breaking only one beam

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