Cable Gauge Calculator

Select a minimum cable cross-sectional area based on BS 7671 or IEC 60364-5-52 current-carrying capacity tables, applying correction factors for temperature, grouping, and protective devices.

Standard & Cable Parameters

Standard

Installation Method

Conductor

Copper Aluminium

Insulation

PVC 70 °C XLPE 90 °C

Load Type

1-Phase 3-Phase

2 loaded conductors (L + N)

Design Parameters

Design Current (I_b)

Supply Voltage (V₀)

Cable Length

Correction Factors

Ambient Temp (C_a)

Grouped Circuits (C_g)

Thermal Insulation (C_i)

Fuse Factor (C_f)

Circuit Type (VD limit)

Results

Temp Factor (C_a)

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Group Factor (C_g)

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Insulation Factor (C_i)

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Fuse Factor (C_f)

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Required I_t

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I_b ÷ (C_a × C_g × C_i × C_f)

Minimum Cable Size

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Tabulated Rating (I_z)

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Headroom

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Voltage Drop

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VD Percentage

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VD Limit

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VD Status

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Current-Carrying Capacity Table

Select parameters above to view the full table.

Size (mm²)	I_z (A)	mV/A/m	VD at I_b & length

This tool is for estimation and educational purposes. Always verify cable selection against the actual standard and local regulations for critical installations.