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#AUTOMOTIVE WIRE GAUGE CHART HOW TO#
#AUTOMOTIVE WIRE GAUGE CHART SERIES#

Between each step the diameter, or thickness, diminishes by 10.557%, and the area and weight diminish by ~ 20%. 50, is 0.001 inches (1 mil or 25.4 μm) in diameter (1 circular mil or 0.7854 millionths of a square inch).

7/0, the largest size, is 0.50 inches (500 mils or 12.7 mm) in diameter (250 000 circular mils in cross-sectional area), and the smallest, No. Following one of its recommendations, it differs from pre-existing gauges scarcely more than they differ among themselves, and is based on a rational system, the basis being the circular mil. The Imperial Standard Wire Gauge, which was sanctioned by the British Board of Trade in 1884, was formulated by J. This is now the American wire gauge (AWG), and is prevalent in North America and used to some extent in over 65 countries, with a market share of about 30% of all power and control wires and cables. Each diameter was multiplied by 0.890526 to give the next lower size.

They established a regular progression of thirty-nine steps between the English sizes, No. The first attempt to adopt a geometrical system was made by Messrs Brown & Sharpe in 1855. But the Birmingham and the Lancashire gauges, the latter being based on an averaging of the dimensions collated from a large number of the former in the possession of Peter Stubs of Warrington (1756-1806), have long held the leading position, and are still retained and used probably to a greater extent than the more recent geometrical gauges.Ĭomparison of SWG ( red), AWG ( blue) and IEC 60228 ( black) wire gauge sizes from 0.03 to 200 mm² to scale on a 1 mm grid – in the SVG file, hover over a size to highlight it 10, for example, would have passed ten times through the draw plate. 1 being the original rod, and succeeding numbers corresponding with each draw, so that No.

#AUTOMOTIVE WIRE GAUGE CHART SERIES#

It is believed that they originally were based on the series of drawn wires, No. The numbers of wire were in common use earlier than 1735 when the measurements were officially defined. The first includes all the older gauge measurements, notably the Birmingham gauge (B.W.G. Wire gauges may be broadly divided into two groups, the empirical and the geometric. This determines the amount of electric current the wire can safely carry, as well as its electrical resistance and weight. Wire gauge is a measurement of wire diameter.

JSTOR ( January 2021) ( Learn how and when to remove this template message)Ī device for measuring American wire gauge.

Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Always double-check to make sure you are buying the correct thickness of wire or cable.This article needs additional citations for verification. Conversely, a large number in AWG equates to a very small number of mm.ĪWG sizes do not fit perfectly into mm or inches, so you may need to round up or down when safe to do so.Ĭable sizes (including AWG) refer to the size of the conductor, not the total thickness of the cable including sheathing etc.ĭo not confuse AWG (American Wire Gauge) with SWG (Standard Wire Gauge, the now largely redundant British Imperial standard which was superseded by mm.) as they are not equal. Wire Gauges run low to high - this means that the smaller a gauge number, the larger it is in mm. For audio, video, telephone, security cabling you may want to use smaller cables sizes where the voltage and current are smaller. AWG #įor AWG 23 and upwards - When using a cable to power mains voltages: (110v, 230v etc) the smallest conductor we recommend is 0.5mm. Somehow we don't see ourselves nonchalantly calculating this in our heads every time we speak with an American customer, so we've made up a conversion table which we'd like to share for your convenience. The n gauge wire diameter dn in millimetres (mm) is equal to 0.127mm times 92 raised to the power of 36 minus gauge number n, divided by 39: dn (mm) = 0.127 mm × 92(36-n)/39 If you want the technical formulae for converting between the two, it is as follows Unfortunately, AWG does not fit comfortably in rounded mm or inches, so there will always need to be a small amount of rounding up or down depending on your need or purpose. The AWG standard was officially adopted & implemented as industry-standard sizing in 1857. What is AWG? The AWG standard was created by the Brown & Sharpe Company, a leading manufacturer of machinist technology in the late 1800s & early 1900s.

#AUTOMOTIVE WIRE GAUGE CHART HOW TO#

Vice Versa, American buyers may be stumped when they are recommended a certain gauge of cable or wire, and don't know how to get it when confronted with mm. When buying cut to length electrical wire or electrical cable, many UK and international buyers face difficulty when confronted with AWG sizing.