Fuse & Cable Sizing Guide for Campervans

Get your fuse sizes and cable sizes right the first time.

This guide shows you exactly how to choose the correct fuse and cable for every part of your campervan 12V system - helping you avoid overheating, voltage drop issues, and unsafe installations.

What this guide helps you do

• Choose the correct fuse for any circuit
• Size cables safely and correctly
• Understand how fuses actually protect your system
• Avoid dangerous undersized wiring
• Build with confidence, not guesswork

What’s inside

• Step-by-step method for sizing cables
• Clear fuse selection rules
• Real examples for common campervan setups
• Easy-to-read tables with both AWG and mm²
• Practical guidance based on real builds
• A blank worksheet to plan your own fuse and cable system

What you’ll learn

• Why fuse and cable sizing matters
• The golden rule - the fuse protects the cable, not the device
• How to size cables using the voltage drop table
• How to size a fuse for any cable
• Where fuses must be placed in a campervan system
• How to plan a safe battery-to-busbar layout

Who this is for

• First-time campervan builders
• DIY van converters who want to build safely
• Anyone unsure about fuse or cable sizing
• Builders who want a clear reference guide instead of piecing advice together online

Important

This guide focuses on safe system design. It explains how to choose the right fuse and cable sizes for your setup in plain English, with worked examples and reference tables throughout.

It is designed to help you understand the process clearly before you build.

Instant download

Get your fuse and cable sizes right before you wire your van.

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