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

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A 12-volt aux run uses 22 AWG copper (640 CM, K = 12.9) for 250 feet one-way to a device that draws 150 mA. What is the approximate voltage drop, and is a detector with a 10.5-volt minimum likely to operate from a 12.0-volt panel output?

About 0.25 V drop; the detector will have plenty of margin About 0.75 V drop; the detector will see about 11.25 V and should operate About 1.51 V drop; the detector will see about 10.49 V and is at or below a 10.5 V minimum About 4.00 V drop; the detector will see 8.0 V

Correct Answer:

About 1.51 V drop; the detector will see about 10.49 V and is at or below a 10.5 V minimum

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