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This allows for a 3% voltage drop through the cable, which is acceptable for most automotive wiring jobs (3% of 12 volts = 0.36 volts). It’s a good guide. Select the wire conductor material, either copper or aluminum. You can also use Advanced mode to set a custom material resistivity at a fixed temperature. Input a value for the current of the system. This figure should be the peak current so that the cable can be sized for the worst case. Change the temperature, if necessary. The value should be the maximum operating temperature that is expected for the wire. Select which electrical system you will be using. Either DC/AC Single-phase or AC Three-phase. That means the calculator can be a simple DC wire size calculator, all the way up to an AC three-phase tool.
AWG (American Wire Gauge) to mm (Millimeters squared) Conversion AWG (American Wire Gauge) to mm (Millimeters squared) Conversion
Input what percentage voltage drop is allowable. The smaller, the better, but the limit is 5% to keep devices working properly.If you can’t measure an individual strand, then measure the diameter of the bundle. It’ll at least give you an indication of the cable’s size.
AWG) Cable / Conductor Sizes American Wire Gauge (AWG) Cable / Conductor Sizes
d n = 0.005 i n c h × 92 ( 36 − n ) / 39 = 0.127 m m × 92 ( 36 − n ) / 39 {\displaystyle d_{n}=0.005~\mathrm {inch} \times 92 American Wire Gauge ( AWG), also known as the Brown & Sharpe wire gauge, is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [1] The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity.If measuring a single strand is too difficult, measure the diameter of the whole bundle. It’s not as accurate but will give you an indication at least. Just make sure you go down a cable size if you do this. The AWG tables are for a single, solid and round conductor. The AWG of a stranded wire is determined by the cross-sectional area of the equivalent solid conductor. Because there are also small gaps between the strands, a stranded wire will always have a slightly larger overall diameter than a solid wire with the same AWG. Auto cable like the SCA example above also uses the 5mm cable terminology. But auto cable is referring to the overall diameter, insulation included , not the cross-sectional area. So if your sparky mate says you need 5mm cable, he’s referring to ISO cable. If you buy auto cable instead, then you’ll most likely buy cable way undersized for the job… and wonder why your fridge keeps cutting out. You might think I’m being unfair. Okay, let’s increase our cable run by just one metre, to 3 metres. What happens? The required cross-sectional area jumps to 2.30 sq. mm, which means you have to use the next size up… 12 AWG.
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