Voltage Drop Limitations on Branch Circuits

The recommended maximum total voltage drop on branch-circuit conductors is ____%.

a) 2
b) 3
c) 4
d) 5

See answer and applicable Code reference

The correct answer is: b) 3

Article 210 outlines the requirements for branch circuits. Branch-circuit rating rules are covered in Part II of this Article. As noted in the first sentence of Informational Note No. 4 of Sec. 210.19(A), "Conductors for branch circuits defined in Art. 100, sized to prevent a voltage drop exceeding 3% at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and where the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5%, provide reasonable efficiency of operation."

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