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What exactly is voltage drop?

AWG circuit conductor dc drop fig load NEC ohm voltage
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What exactly is voltage drop?

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The voltage drop of a circuit is in direct proportion to the resistance of the conductor and the magnitude of the current. If you increase the length of a conductor, you increase its resistance — and thus increase its voltage drop. If you increase the current, you increase the conductor voltage drop. Thus, long runs often produce voltage drops that exceed NEC recommendations.

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