Section 02 · Algebraic Circuits & Conduit
The Electrician
Pick a lab below. Every calculator obeys real NEC rules — ampacity, derating, continuous-load limits, and voltage-drop targets.
Voltage Drop Calculator (Single-Phase)
V_drop = 2 × I × R × L • %drop = V_drop ÷ V × 100
NEC §210.19(A) / §215.2(A)(4) recommend ≤ 3% branch / ≤ 5% total drop so equipment runs at rated voltage.
Source:
R / 1000 ft
1.93 Ω
Round-trip ft
150
Voltage drop
4.63 V
% drop
3.86%
Exceeds 3% branch — borderline
Voltage at load ≈ 115.4 V