# How to calculate wire gauge size

Wire Size Calculator – How to calculate wire gauge

To calculate ground wire size, use the Ground Wire Size Calculator. Insulation - Select the thermal rating of the insulation on the wire. Conductor - Choose the material used as a conductor in the wire. Common conductors are copper and aluminum. Using load_current and length, we first find the wire gauge that meets the selected voltage_drop. We find a wire gauge for which the ampacity is higher than the fuse size (fuse size per owner’s manual, otherwise we compute it as follows: fuse_size = load_current x ). We compare 1. and 2. above and keep the wire with the largest gauge.

Last Updated: Yauge 17, References. This article was co-authored by Ricardo Mitchell. Ricardo has over 10 years of electrical and construction experience and his partners have how to calculate wire gauge size 30 years of relevant experience.

There are 15 references cited in this article, which can be found at the bottom of the page. This article has been viewedtimes. The larger the diameter of the wire, the smaller its gauge number will gzuge.

You can measure the gauge on either round solid wire an yauge wire with no insulation or stranded wire a number of strands wrapped together. Start by stripping the insulation with a wire stripping tool.

Place 2 inches of wire through the tool, clamp it down, and pull off the insulation to expose the wires inside. Then, untangle and straighten the wires and use either a ruler or a wire and conduit measuring tool to measure the diameter of a single wire. Double the wire's diameter calculatr you can calculate the gauge of a stranded wire. Then, multiply that number by the number of individual wire strands to find the Circular Mils value.

By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article methods. Tips and Warnings. Things You'll Calcuoate. Related Articles. Article Summary. Method 1 of Purchase a wire-stripping tool. The wire-stripping tool is specifically designed for this task: it looks a little like a pair of what is a birthing stool. The tool has a small hole near its tip, which is lined with a sharp blade to cut through and remove plastic insulation.

Place two inches of wire through the stripping tool. Your insulated wire should fit how to calculate wire gauge size into the small, sharp hole in the wire-stripping tool. Stripping the insulation off of about 2 inches 5 cm of wire will give you plenty to work with when measuring gauge. Clamp down and pull off the insulation.

Pull the stripper tool away from the full piece hiw wire to slice through the plastic insulation and slide it off the end of the wire. Contact the wire manufacturer for the diameter of insulated wire. They may be able to identify the company, and if not, they can measure the wire for you anyway.

The diameter measurement will not be an actual gsuge size, since only uninsulated solid wrie are gauged. Method 2 of Purchase a wire gauging how long can fresh eggs stay out of the refrigerator. A wire gauging tool is a piece of metal typically circular or rectangular which is studded gajge dozens of holes around its perimeter.

Each hole is labeled hoow corresponds to—a different gauge size. You can purchase a wire gauging tool at your local hardware store or home-supply store. Estimate the gauge size of the wire. Begin by eyeballing the approximate size of the wire and see which gauge holes are roughly the same size.

Slide your wire into the gauge groove and see where it fits. Place the wire into each groove until you find the best fit. Your wire will correspond with the size of the smallest gauge groove that it slides into. The fit should be snug but not too tight.

These holes are not used to measure gauge size. Compare the wire against another wire whose gauge is known. For example, if you have xalculate small-diameter section of wire, hold it next to wires of known gauge e. Siae 3 of Measure the diameter of a single wire. This tool can also be purchased at any hardware store. The result will be 0. Multiply the how to calculate wire gauge size by the number of strands in the wire.

Depending on the size sizw the wire, it could have any number of individual, entwined strands. Count the individual strands, and multiply the result of the squared wire diameter by the number of strands. In this example, if the wire has 21 strands, multiply 0. CMA is another commonly used wire-gauge scale which calculates the circular claculate of wires. As a general rule, larger-gauge wire smaller diameter contains fewer strands.

Thanks to all authors for creating a page that has been readtimes. How to calculate wire gauge size this article help you? Cookies make wikiHow better. By continuing to use our site, you agree to how to clean the outside of a clarinet cookie policy.

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Steps to Find the Diameter First – find the exponent in the equation by subtracting the wire gauge from 36 then dividing by Finding the exponent for 00, , and gauge wire is slightly different. Substitute -1, -2, and -3 for the gauge in the formula above instead of the AWG value. Feb 21,  · Wire Gauge *Use the MPPT amp rating for the output cable size. When panels are wired in series, use lowest amp rating of the panels to size the input cable (or just use standard 10 AWG solar cable). For other components, use the Quick Look Up Tool above. American wire gauge size calculator and chart. Wire gauge calculations Wire diameter calculations. The n gauge wire diameter d n in inches (in) is equal to in times 92 raised to the power of 36 minus gauge number n, divided by d n (in) = in ? 92 (n)/ The n gauge wire diameter d n in millimeters (mm) is equal to mm times 92 raised to the power of 36 minus gauge.

Sharing this tool with others is the best way to say thanks if you found it useful. Thanks for supporting us and for keeping this website alive! Disclosure: This post contains affiliate links, which means that if you click a product link and buy anything from the merchant, we will receive a commission fee. The price you pay remains the same, affiliate link or not. Wires can carry a certain amount of current continuously and no more; more current means the wire will overheat and melt as it cannot dissipate the heat that is generated by too much current flow.

Certain factors reduce the ampacity rating of wires, and the voltage drop as well:. This is not an ABYC requirement at the moment; however, it is generally accepted by marine product manufacturers such as Blue Sea. Did we mention you actually don't need to use this calculator? It doesn't get easier than this! Here it is in action:.

Always use the maximum current that the load is expected to draw. The Maxxfan can draw up to 2. As a result, you'll get slightly oversized wires which is quite good for safety, performance and durability. The wire length input is always the round-trip length. The round-trip length is the sum of the positive and the negative wires. Remember that a duplex wire packs the positive and the negative into a single wire, so the round-trip length is equal to twice the duplex length.

There is a loss of energy voltage drop as current moves through passive elements terminal, fuse, wire, etc. The easiest way to determine the fuse size is to follow the manufacturer recommendations! So check the owner's manual or specifications sheet. Can't find it? OK then. In the Maxxfan scenario: 4A x 1. However, it looks like the manufacturer recommends a 10A fuse so we'll stick to that.

In the scenario where we have no clue how much current the Maxxfan draws load current , we'll use the fuse size instead. Using our Google superskills, we find that the manufacturer recommends a 10A fuse:.

This is to "compensate" for the slightly oversized wire that this method gives. As always, we want to use the maximum current as an input.

Actually, the inverter can work down to But according to the specifications sheet, the "maximum input current" is A. We always follow the manufacturer recommendations, so:. As always, we want to use the round-trip length as an input. That's the sum of the positive and negative wires:. Because they care about how their product performs in the real-world, not just on the specifications sheet. For example, most inverters stop working below According to the Samlex owner's manual, a fuse of A is recommended:.

Made with in our van. Share this TOOL:. Share on facebook Facebook. Share on pinterest Pinterest. Share on reddit Reddit. This means even if your friend installed the same components e. This calculator does not supersede manufacturer recommendations and is for reference only; have your diagram and installation checked by a professional. How can we help today?

Better accuracy. Load Current Maximum current flow expected from the load. Fuse size As recommended by the manufacturer. Voltage Drop The loss of energy as current moves through a wire results in voltage drop. A larger wire offers less resistance and therefore minimize voltage drop. I don't know, tell me! Per owner's manual. Derating Factors Factors that impact the ampacity or the voltage drop of wires. This is most likely the case for wire running in ceiling or wall, as it gets much hotter than in the living space of the van especially for dark color van.

The max current that the wire can safely carry is reduced because it has less capacity to dissipate the heat generated by the current flow. Load runs continuously for 20 minutes or more? This is to mitigate the fact that more heat builds up in the wire if the current flows continuously. Wire in conduit, insulation or bundled with 2 or more wires?

Recommended Wire. A Maximum current that a wire can carry continuously without exceeding its temperature rating. A Corrected ampacity when taking derating factor s into account. Fuse too small. How this wire calculator works. Based on Load Current:. We compare 1. Based on fuse size:. We find a wire gauge for which the ampacity is higher than the fuse size. We compare 2. Derating Factors:.

Load runs continuously for 20 minutes or more. Wire in conduit, insulation or bundled with 2 or more wires. Making things easy. Wiring Diagram. Maxxfan Wire Sizing Example. Load Current. Wire Length. Voltage Drop. AWG Method 2: Calculate Wire Gauge from fuse size. Easier, but may result in slightly oversized wires which is totally fine in terms of safety and performance; the downside is the cost!

Fuse Size. Same same! Per calculator:. AWG 1. The inverter is the most finicky and dangerous part of an electrical system. While you can use this calculator for sizing the wires, we highly recommend to follow the manufacturer recommendations from the owner's manual fuse size, wire gauge and wire length. That'll ensure the inverter installation is safe and performs as it should. We're just getting started.

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