Measurement diameter and wire caliper Perform the absence of voltage.Any caliper regardless of whether it is a mechanical or electronic, metal sponge is capable of conducting current.If the wire is coated with a layer of insulation, measuring its section carried out without taking into account its diameter well.
used to express diameter and cross-sectional area of ​​conductors and units of measure in electrical engineering: respectively, millimeters and square millimeters (electricians call them short for "square").
To put in the directory specified wire cross section his diameter , use the following formula: D = 2√ (S / π), where S - area of ​​the conductor (mm²), D - conductor diameter (mm), π - nu
mber of "pi" 3.1415926535 (dimensionless).
for a reverse translation ( diameter and in cross-section), use the same formula, transformed as follows: S = π (D / 2) ², where D - diameter conductor (mm)S - area of ​​the conductor (mm²), π - number of "pi" 3.1415926535 (dimensionless).
cross section stranded wire take equal to the sum of the cross sections of the constituent individual wires.Summarize their same diameter s pointless.Calculations can be multi-stage.For example, to find an equivalent diameter stranded wire , calculate the cross section of one of his veins, multiply by the number, and then put the result back in diameter .
Take wire with diameter th or section exceeds the calculated or specified in the table, you can, but too thick wire used is inconvenient: they can, for example, to pull out the terminal from the terminal its own weight.Apply the same wires with a diameter ohms or less than the calculated cross-section, or can not be shown in the table.
Hollow conductors cylindrical shape (eg, a part of coaxial cables) have a diameter of two as: external and internal.According to him, calculate respectively two sections: external and internal.Subtract one from the other, and then place the result in equivalent diameter .