The Definition Of Wire Square Is Related To Wire Diameter And Current Carrying Capacity

In the national standard CWG, a few square meters is the nominal value of a wire diameter specified by the Chinese standard. The number of squares is the user's choice of wires and cables according to the load of the wires and cables. The number of squares of wires is an oral term in the renovation of hydropower construction. The square wire often refers to the square millimeter mm2 wires.

       The square of the wire is nominally called the wire cross-sectional area, that is, the area of the circular cross-section of the wire, in square millimeters. Generally speaking, the empirical power-carrying capacity is when the grid voltage is 220V, the empirical power-carrying capacity per square wire is one kilowatt About, the current is about 5A.

       Copper wire can carry 1 to 1.5 kilowatts per square meter, and aluminum wire can carry 0.6 to 1 kilowatts per square meter. Therefore, one square copper wire is sufficient for electrical appliances with a power of 1 kilowatt.

       When it comes to current, the copper wire can carry 3A~5A current per square meter during short-distance transmission. When the heat dissipation conditions are good, use 5A/square millimeter copper wires, and when the heat dissipation conditions are not good, use 3A/square millimeter copper wires.

一,Conversion method related to the square of the wire:

       1. If you know the square of the wire, calculate the radius of the wire with the formula for calculating the area of the circle: S square number of wires (mm2) = pi (π is 3.14) × square of wire radius (R is mm2)

S=π*R2

       2. Know the square of the wire and calculate the wire diameter as well

d=2R=(√S/π)*2

For example: the wire diameter of a 2.5 square wire, d=2.5÷ 3.14 = 0.8, and then a square root to get the radius: r=0.9 mm, so the wire diameter of a 2.5 square wire: d=2×0.9 mm=1.8 mm.

       3. Know the wire diameter d, calculate the square of the wire, and use the formula for finding the area of a circle to calculate: wire square S = circumference ratio (3.14) x wire diameter d/2 square

S=π*(d/2)2

       4. The size of the cable is also nominally squared, and the multi-strand cable is the sum of the cross-sectional area of each conductor.

       The calculation formula of the cable cross-sectional area: S=0.7854×the square of the wire radius (mm2)×the number of strands.

S=0.7854*R2*the number of strands

For example: 48 strands of 1.5 square cable (each wire has a radius of 0.2 mm) = 0.7854 × (0.2 × 0.2) × 48 = 1.5 square

二,National standard wire square and diameter comparison table (reference material BV plastic copper wire and BLV plastic aluminum wire):

三,Copper wire ampacity meter at 25℃

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