AS/NZS 3008.1.1·AS/NZS 3000:2018·AS/NZS 5033·IEEE 1185-2019

Cable sizing and electrical design, done to the standard.

Calculate cable sizes, voltage drops and maximum demand with precision. Draw the single line diagram, link it to the numbers, and export reports a certifier can sign.

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C1 · Main switchboard feeder

25 mm² 4C+E Cu · 2 × 1C

VD 1.31 % · Zs 0.42 Ω · PASS

How It Works

One workflow from load to signed-off report

Start sizing cables, creating SLD drawings and calculating maximum demand in minutes. No complex setup required.

01
Size
Enter the load, run length and installation. The engine applies every derating table, checks voltage drop and fault loop impedance, and picks the smallest compliant cable.
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02
Draw
Lay out the single line diagram, link each cable to its calculation, and let the schedule update itself as the design changes.
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03
Demand
Build the maximum demand study with AS/NZS 3000 Appendix C diversity, per phase, and size the mains from it.
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04
Report
Export branded PDF reports, cable schedules and drawings with the full working, ready for the certifier.
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Try the engine

Size a cable right now

A simplified AS/NZS 3008 estimate, no account needed. The full calculator adds every derating table, fault loop impedance and protection checks.

Load Current (A)Cable Length (m)VoltageConductorInstallation

An estimate from AS/NZS 3008.1.1:2025 for a single thermoplastic (V-75) multicore cable at 40 °C ambient (25 °C in the ground), with no derating and the worst-case voltage drop at 75 °C. It lets this cable use the whole 5%, which AS/NZS 3000 shares with the consumer mains and submains. For derating, fault loop impedance and protection checks, use our professional calculator.

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Powerful Features

Everything you need for electrical engineering

Streamline your electrical engineering workflow

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Cable Sizing

AS/NZS 3008 Compliant
Voltage Drop Analysis
Derating Factors
PDF Reports

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SLD Drawings

Drag & Drop Editor
Professional Symbols
Export to PDF/SVG
Linked Cable Schedule

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Maximum Demand

AS/NZS 3000 Compliant
Diversity Factors
Load Scheduling
Detailed Reports

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Conduit Sizing

Space Factor Calculation
Multiple Cable Types
Standard Conduit Sizes
Free to Use

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String Voltage Calculator

Solar PV String Voltages
Temperature Coefficients
Min/Max Configurations
Inverter Compatibility

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Voltage Drop Calculator

AS/NZS 3008 Compliant
Single & Three Phase
Copper & Aluminium
Free to Use

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Voltage Rise Calculator

Solar PV Systems
Generator Connections
Regenerative Drives
Free to Use

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Why Choose CableHero

Trusted by electrical engineers across Australia

CableHero is designed by electrical engineers, for electrical engineers. We understand your workflow and compliance requirements.

AS/NZS 3008 & 3000 Compliant
Professional PDF Reports
Cloud-based & Accessible Anywhere
Regular Updates & Support

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Simple Pricing

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Starter

Best For: Minor projects

Free

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Key Features:

1 project with 50A load limit
AS/NZS 3008 & 3000 compliance
Real-time calculation feedback
Basic cable sizing tools

Individual

Best For: Electrical Engineers, Electricians, Designers

A$250 /year

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Key Features:

Unlimited projects & loads
All tools: cable sizing, SLD drawings, conduit calculator
Maximum demand calculator
Custom PDF reports with your logo
Priority support & updates

Enterprise

Best For: Teams & Organisations

Key Features:

Everything in Individual plan
Team management & collaboration
Flexible seat-based licensing
Shared projects & calculations
Dedicated support

Built on the standards you certify against

AS/NZS 3008.1.1
AS/NZS 3000:2018
AS/NZS 5033
IEEE 1185-2019

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Have questions about CableHero? Need help with your electrical calculations? Our team is here to help. Send us a message and we'll get back to you as soon as possible.

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Get ready to simplify your electrical designs

Start calculating cable sizes, generating SLD drawings and creating professional reports in minutes. Join thousands of electrical engineers using CableHero.

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