Electricity & EquipmentQuestion 407 of 484
A salon outlet is wired through a GFCI device. The GFCI compares which two measurements and trips when they differ?
a.Current flowing out on the hot wire versus current returning on the neutral wire; a difference indicates leakage to ground (a person)
b.Voltage of the hot wire versus voltage of the ground wire
c.Resistance of the device versus resistance of the wall
d.Wattage of the appliance versus wattage of the circuit
Explanation
A ground-fault circuit interrupter continuously compares the current leaving on the hot wire with the current returning on the neutral wire. In a healthy circuit they are equal. When even a few milliamps (typically 4 to 6 mA) of current leaks elsewhere, for example through a person standing in water, the GFCI senses the imbalance and trips within milliseconds, well before the current is sufficient to stop a heart. California requires GFCI protection at receptacles near water sources, consistent with CCR Title 16 §979.2 and the National Electrical Code. The other options describe measurements the GFCI does not perform.
Law Reference: CCR Title 16 §979.2Practice all 484 questions free — no signup required.
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