Swg standard or sterling wire gauge a british wire measurement system. The n gauge wire diameter d n in millimeters mm is equal to 0127mm times 92 raised to the power of 36 minus gauge number n divided by 39.
Know How Notes Automotive Wiring Guide
How to determine automotive wire gauge. The result will be 0000025 in 0000635 mm. To calculate the gauge of stranded wire youll need to double the diameter. Multiply the wires diameter by itself. Compare the number of strands and the size of the strand to the chart below to determine the gauge. Measure the diameter of a single strand not the whole bundle of strands which make up the cable or get this information from the cable suppliers website. How to determine the gauge of your automotive wire make a 12 cut in the wire.
Count the individual strands of copper. American wire gauge awg is a system of numerical wire sizes that start with the lowest numbers 60 for the largest sizes. So if youve measured a wires diameter to be 0005 inches 0127 mm multiply this value by itself. Outside engine compartments the ambient temperature should generally be 20c. The gauge sizes are each 26 apart based on the cross sectional area. In general the larger the current draw the larger gauge wire you need to properly power the accessory.
Count the number of strands. Use a micrometer to measure one of the strands. Awg is also known as brown sharpe gage. Over 16 feet with 3 voltage drop a 50 amp circuit requires 4 gauge power wire. To determine how big the wire needs to be you have to figure the approximate length of the wire from the amp installation point to the battery all amps must be wired directly to the battery. You can use a common wire stripper however to determine the diameter or the gauge size of the wires.
Wire size is measured by gaugethe smaller the gauge number the larger the wire. Enter these two figures in the calculator and youll get the cable area in sq. You not only can strip wires of a specific size but can also determine the gauge size of the wire. Choosing the correct gauge automotive wire depends on the acceptable voltage drop length of the feederbranch circuit conductor load amperage and the ambient temperature of the compartment where the primary wire will pass through. The gauge you need depends on the current draw of the accessory and the wire length between the accessory and the power source. Dn in 0005 in 92 36 n39.
For our example we are going with 16 feet. Most wire strippers have a series of round holes labeled with awg sizes where you can insert the wires.
Gallery of How To Determine Automotive Wire Gauge
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