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

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A 24.0 V NAC has a 0.40 A alarm load. Each 18 AWG copper conductor is 500 feet long and has a DC resistance of 8.08 ohms per 1,000 feet (NEC Chapter 9, Table 8, coated copper at 75°C). What is the voltage at the last device if the entire load is treated as being at the end of the run?
Correct Answer:
20.77 V

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