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Use the calculator below to figure out the cross-sectional area of the cable, then use the Cable Size Chart to match it to the nearest size. The point is, the only information that’s useful is the cross-sectional area of the cable. Everything else is misleading rubbish. The hotter the cable, the more voltage drop through the cable. If you’re running a cable from a battery under the engine bay, it can get pretty hot… like 70 deg C or more.
AWG Wire Gauge Size Chart - Electronics Reference
Copper is way more expensive than plastic insulation, so many manufacturers of auto cable make the copper wiring ridiculously thin. Another example of auto cable. This cable gives you no useful information whatsoever! 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. The problem is, most of the AWG sizes they’ve listed don’t match the cross-sectional areas. At least they specify the cross-sectional area I suppose… This brand gives a lot more information, but it’s not too clear. “24 x 0.2mm” means 24 strands of 0.2mm diameter wire. Using the Cable Area Calculator above, this equates to 0.75 sq. mm cross-sectional area, which is actually just under 10% smaller than 18 AWG. So even this isn’t accurate.Buy cable with an AWG size. This is an American Standard for cable sizes and you’ll likely get the correct cabling for the job.
4 AWG AUTOMOTIVE CABLE 170 00AMP 2040WATTS RATED 25mm2 4 AWG AUTOMOTIVE CABLE 170 00AMP 2040WATTS RATED
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. Obviously the cable carries the current, so the cross-sectional area of the copper wire is super-important when you’re trying to size a cable. 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 92gives a cable cross-sectional area of 1.53 sq. mm. This corresponds to a 14 AWG cable in the Cable Size Chart above.
American Wire Gauge (AWG) Cable Conductor Size Chart / Table American Wire Gauge (AWG) Cable Conductor Size Chart / Table
Input what percentage voltage drop is allowable. The smaller, the better, but the limit is 5% to keep devices working properly. Now, there’s a commonly used standard called the ISO Standard. A 5 ISO cable for example, has a cross-sectional area of 5mm 2 (or sq mm). Electricians often refer to it as a 5mm cable. 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.
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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. volts (2%) is best for large cables like battery cables 4AWG (25 ISO) or larger, carrying large currents. Why? Because they won’t heat up as much and the power loss will be lower (see below). 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. Change the temperature, if necessary. The value should be the maximum operating temperature that is expected for the wire. Say you run a positive cable from the battery to a compressor. Distance is 2 metres. If you run the negative to ground from the compressor at the compressor, then total cable length is 2 metres (plus a bit for the negative cable).
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