4 Gauge 4 AWG 25 Feet Red + 25 Feet Black ( 50 Feet Total ) Welding Battery Pure Copper Flexible Cable Wire -- Car, Inverter, RV, Solar by WindyNation
About this deal
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. The point is, the only information that’s useful is the cross-sectional area of the cable. Everything else is misleading rubbish. 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.
AWG (American Wire Gauge) Size Conversion Calculator Wire AWG (American Wire Gauge) Size Conversion Calculator
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. 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.Now, if we change the cable run to 20 metres, then the cable cross-sectional area needed is 15.3 sq. mm. This corresponds to 16 ISO or 4 AWG cable.
Amperage and Wire Gauge Chart: What Size You Need - The Spruce
gives 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), 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.  The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity.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.