Free Calculators

ELEK logo symbol only large size Kittl white - Cable Size Calculator AS3008
ELEKTM Power Engineering Software
ELEKTM Software

Cable Size Calculator AS3008

This free electrical calculator determines the minimum cable size based on current-carrying capacity and voltage drop.

The calculations comply with Australian Standard AS/NZS 3008.1.1.

Your Calculated Cable Size Is:

Why This Result?
The minimum active cable size is provided which meets the current-carrying capacity and the maximum voltage drop requirements. Note that a cable size larger than this minimum is also acceptable and may be more economical in terms of electrical losses over its lifetime.

The table number used from Standard AS/NZS 3008.1.1:2017 is provided with the result for your reference and checking of the results by you.

**Disclaimer**: Our electrical calculators are intended for use by qualified electrical professionals only. While we strive to provide accurate and up-to-date information, these tools are provided as a guide and should not replace professional judgment or compliance with relevant standards and regulations. Users must verify the results independently and assume full responsibility for their application.

Click the demo to explore the AS 3008 and AS 3000 compliant features:

Need a Professional Report?

A laptop, tablet, and smartphone display cable sizing software with various graphs, tables, and settings for cable installation and protection.

Cable Pro Software can do all the necessary electrical calculations and produce reports. Comprehensive Cloud-Based Software for Cable Sizing, Maximum Demand Calculations, Protection, Arc Flash Analysis, and LV Network Design

A laptop, tablet, and smartphone display cable sizing software with various graphs, tables, and settings for cable installation and protection.

How to use

Calculator inputs explained

Voltage (V)

Phase

Load

Maximum voltage drop (%)

Power factor

Cable length (m)

Conductor

Insulation

Installation

Frequently asked questions

What voltage drop (%) should be used?

How do I calculate multiple parallel circuits?

How can I determine a derating factor?

How do I calculate voltage rise instead of voltage drop?

How do I enter a 3-phase current?

Can I calculate the size for flexible aluminium cables?

What should I enter for power factor?

How do I calculate the cable size for an unbalanced 3-phase system?

If the out-of-balance conditions are inconsistent or intermittent:
Where the currents in each phase are different in magnitudes for consistent periods: