AS/NZS 3008:2017

Voltage Drop Calculator

Calculate voltage drop for AC and DC circuits per AS/NZS 3008.1.1 — verify compliance with AS/NZS 3000 allowable limits.

Calculation Parameters
Calculate
Phase Arrangement
Voltage (V) Line-to-line for 3φ, line-to-neutral for 1φ
Load
Cable Properties
Conductor Material
Cable Type
Insulation Affects resistance values at operating temp
Cable Size (mm²) Per AS/NZS 3008 standard sizes
Cable Length (m) One-way distance, not total conductor length
Allowable Voltage Drop (%) AS/NZS 3000 Cl 3.6.2: typically 5%
Voltage Drop
Voltage drop—
Percentage drop—
Allowable limit—
Compliance—
Cable Data
Load current—
Cable size—
Cable length—
Resistance Rc—
Reactance Xc—
Impedance Zc—

Calculation Methodology

StepParameterFormula / SourceValue

AS/NZS 3000 Allowable Voltage Drop Limits

ApplicationAllowable Drop
Point of supply to final subcircuit (general, residential)5 %
LV transformer to final load7 %
Final subcircuit — consumer mains1.5 % (guideline)
Final subcircuit — submain1.5 % (guideline)
Final subcircuit2.0 % (guideline)
Motor starting (at motor terminals)15 % max dip

Reference: AS/NZS 3000:2018 Clause 3.6.2 and Table 3.4