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Calculators & Tables FAQs

Q What size cables do I need to use in my electrical installation?

The size of the cable is determined by the amount of current going through the cable and the cable's run length. The easiest way to work the cable size out is by using our Voltage Drop Calculator.

Q What size heat shrink sleeving will fit my cable?

We have made a chart showing which size heat shrink sleeving can be used for each cable size.


What size fuse do I need to use?

A The fuse needs to be rated above the current that is going through the cable and below the cable's overall rating. For example, if you had a 5A load going through 21A cable, you could use a fuse between 7.5-15A.


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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