A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067×10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area values in circular mils knowing the diameter in mils. The area in circular mils, A, of a circle with a diameter of d mils, is given by the formula:
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| - Circular mil (de)
- Circular mil (en)
- 圓密耳 (zh)
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| - circular mil gilt als eine kleine englische Flächeneinheit und wird vorrangig zur Querschnittsbestimmung von Drähten und Kabeln verwendet. Das angloamerikanische Maß ist gleich der Fläche eines Kreises mit einem Durchmesser von einem mil, dem 1000. Teil des Inches (0,001 Inch).
* 1 circular mil = 0,0005067 Quadratmillimeter = 5,067075 × 10−4 Quadratmillimeter
* 1 circular mil = π⁄4 × 10−6 Quadratzoll= 7,853982 × 10−7 Square-Inch
* 1 circular mil = 0,7853982 Square-mil Üblich in Bezug auf größere Leitungsstärken ab 0000 AWG ist auch die Verwendung von kcmil (= 1000 cmil). (de)
- 圓密耳（英文：circular mil）是一種面積單位，又稱圓密爾，等於一個直徑爲 1 密耳（千分之一英寸）的圓的面積，相當於 5.067×10^-6 平方毫米。這個單位的制定和具有圓形截面的電線有關，使用這個單位可以避開圓周率的計算，這使得橫截面積和其直徑的對應轉換變得十分容易。 在美國和加拿大使用的（National Electrical Code, NEC）中使用圓密耳定義比 0000 AWG（直徑爲 0.46 英寸，即 11.684 毫米的電線）粗的導線尺寸。大的電纜可以使用千圓密耳作單位，有 MCM 和 kcmil 兩種縮寫方式。 1 圓密耳 = π/4 方密耳 ≈ 0.785398 方密耳 1 方密耳 = 4/π 圓密耳 ≈ 1.273240 圓密耳 (zh)
- A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067×10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area values in circular mils knowing the diameter in mils. The area in circular mils, A, of a circle with a diameter of d mils, is given by the formula: (en)
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| - A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067×10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area values in circular mils knowing the diameter in mils. The area in circular mils, A, of a circle with a diameter of d mils, is given by the formula: In Canada and the United States, the Canadian Electrical Code (CEC) and the National Electrical Code (NEC), respectively, use the circular mil to define wire sizes larger than 0000 AWG. In many NEC publications and uses, large wires may be expressed in thousands of circular mils, which is abbreviated in two different ways: kcmil or MCM. For example, one common wire size used in the NEC has a cross-section of 250,000 circular mils, written as 250 kcmil or 250 MCM, which is the first size larger than 0000 AWG used within the NEC. 1000 circular mil equals 0.5067 mm2, so for many purposes, a ratio of 2 MCM ≈ 1 mm2 can be used with negligible (1.3%) error. (en)
- circular mil gilt als eine kleine englische Flächeneinheit und wird vorrangig zur Querschnittsbestimmung von Drähten und Kabeln verwendet. Das angloamerikanische Maß ist gleich der Fläche eines Kreises mit einem Durchmesser von einem mil, dem 1000. Teil des Inches (0,001 Inch).
* 1 circular mil = 0,0005067 Quadratmillimeter = 5,067075 × 10−4 Quadratmillimeter
* 1 circular mil = π⁄4 × 10−6 Quadratzoll= 7,853982 × 10−7 Square-Inch
* 1 circular mil = 0,7853982 Square-mil Üblich in Bezug auf größere Leitungsstärken ab 0000 AWG ist auch die Verwendung von kcmil (= 1000 cmil). (de)
- 圓密耳（英文：circular mil）是一種面積單位，又稱圓密爾，等於一個直徑爲 1 密耳（千分之一英寸）的圓的面積，相當於 5.067×10^-6 平方毫米。這個單位的制定和具有圓形截面的電線有關，使用這個單位可以避開圓周率的計算，這使得橫截面積和其直徑的對應轉換變得十分容易。 在美國和加拿大使用的（National Electrical Code, NEC）中使用圓密耳定義比 0000 AWG（直徑爲 0.46 英寸，即 11.684 毫米的電線）粗的導線尺寸。大的電纜可以使用千圓密耳作單位，有 MCM 和 kcmil 兩種縮寫方式。 1 圓密耳 = π/4 方密耳 ≈ 0.785398 方密耳 1 方密耳 = 4/π 圓密耳 ≈ 1.273240 圓密耳 (zh)
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