How To Calculate Wire Length

By | November 5, 2020



When it comes to home wiring projects, knowing how to calculate wire length is an essential skill. Whether you are installing an electrical system in a new build or just replacing a faulty outlet, understanding the exact length of the wiring needed for the job is absolutely key. After all, wire that’s too short won’t reach the destination, and too long a length can create dangerous tangles or cause other issues. Calculating wire length might seem tricky at first, but if you understand the formula, it’s actually quite easy.

To calculate wire length accurately, you need to know three main pieces of information: the amperage, the wire gauge and the distance. You can easily find the amperage and wire gauge on a wire label or by consulting the wiring diagram. The distance is the total linear feet of the wiring run. Once you have these three pieces of information, you can use a simple formula to get the exact length of wire you need. Here’s how it works.


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