Wire Size Calculator

including Switches, Relays & Fuses

DISCLAIMER! Mowgli Adventures has made every effort to ensure that the results generated by the wire size calculator are correct and valid. However, Mowgli Adventures warrants nor accepts any liability for the its use.

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Sizing the major components of a campervan electrical system is a crucial part of your build. 

The Anatomy of a Wire A wire is made up of insulation – the plastic sheath – and the conductor – the metal strands inside the insulation.

Why is it Important to Use the Proper Wire Size? Electrical wire has a certain amount of resistance, resulting in an amount of voltage drop from one end to another.

Wire Length Electrical current transmits through the wire, but the longer the wire, the greater the resistance and the greater the voltage drop.

Temperature As current flows through a wire, the resistance generates heat. If the wire is too small for the current passing through it, the wire may get so hot it causes a fire.

High Current Components We recommend going up one wire size for heavy current components like inverters, heaters, and water heaters.

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