NEC 2026 Compatible

When calculating voltage drop for AC circuits, which factor is NOT typically included in the simplified voltage drop formula (VD = (2KIL)/CM or (1.732KIL)/CM)?

Journeyman Level📋 General electrical theory, not a specific NEC article, but relevant to VD calculations.Factors in Voltage Drop
Circuit Diagram
Voltage Drop Calculation — NEC 210.19(A) Info Note SOURCE PANEL 120V Hot — #12 AWG Cu Neutral — #12 AWG Cu 91 ft one-way LOAD 10A 116.4V Vd = 3.6V 3.0% Voltage Drop NEC recommends ≤3% branch circuit, ≤5% total (branch + feeder) Vd = (2 × K × I × D) / cmil K=12.9(Cu) I=10A D=91ft cmil=6530(#12) Vd = (2 × 12.9 × 10 × 91) / 6530 = 3.60V (3.0%)
A

Conductor length

B

Conductor material resistivity

C

Inductive reactance of the conductor

D

Load current

Explanation & Direct Citation

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    Factors in Voltage Drop Practice Question: General electrical theory, not a specific NEC article, but relevant to VD calculations. | SparkShift | SparkShift