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Cables & Wiring FAQs

Q Is your cable specified by the outside diameter of the cable, including insulation?

No, all our cable is specified by the cross-sectional area of the copper conductor (in mm²) which is related to the current carrying capacity. Cable insulation thickness changes by manufacturer and cable type so you should never rely on outside diameter alone.

Q I have heard the voltage drop also needs to be taken into account when selecting cable, but how do you calculate this?

Yes, voltage drop is one of the most important elements to consider when designing your 12V electrical system. See our voltage drop calculator to help you select the correct cable.

Q What cable size should I use for my compressor fridge?

The motors driving the compressors in these fridges tend to be quite sensitive to voltage drop, and if the voltage becomes too low it can prevent them from starting-up.  The fridge manufacturer's handbook will usually recommend a cable size for a given cable run length (from battery to fridge) and this can be much larger than you would expect (perhaps between 6 and 10 mm²). This large size is not because a high current will be drawn (these fridges tend to draw only around 3-4A); it is to prevent voltage drop from being an issue.








Featured News Articles

Wednesday, 29 September 2021  |  Craig
Connecting Multiple Wires

Today we will be looking at making multiple connections. This is something that can be handy when looking to reduce the number of messy wires you will have in your vehicle but one that can cause a lot of confusion to 12 Volt newcomers. So first what are the benefits? ..

Thursday, 14 April 2022  |  Craig
Extending Cable for 12V Compressor Fridge

Installing a 12V compressor fridge can look quite simple on paper, but some not-so-obvious issues need to be taken into account to prevent problems. We take a look at these, how they may affect your build and what can be done to resolve these issues.


Disclaimer - The information contained in these articles is provided in good faith and we do our best to ensure that it is accurate and up to date, however, we cannot be held responsible for any damage or loss arising from the use or mis-use of this information or from any errors or omissions. The installer is ultimately responsible for the safety of the system so if you are in any doubt, please consult a qualified electrician.

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