How do you look at the square footage of electrical wires? How is the square of a wire calculated? How is the square of wire and cable calculated?

Wire a few square is a national standard for a nominal value, the square of the wire is actually marked by the cross-sectional area of the wire, that is, the area of the circular cross-section of the wire, the unit is square millimeters. Is the user according to the load of the wire and cable to choose the wire and cable. That wire how to see the square number of it? How is the square of the wire calculated? The specifications of electric wire are commonly used internationally in three standards: American (AWG), British (SWG) and ours (CWG). How to see the square number of the wire? How many squares is a nominal value stipulated by the national standard, and how many squares is the user's choice of wire and cable according to the load of the wire and cable.

Wire square number is a verbal term in the decoration of plumbing and electrical construction, often said a few square wires are not added to the unit, that is, square millimeters. The square of the wire is actually labeled as the cross-sectional area of the wire, that is, the area of the circular cross-section of the wire, the unit is square millimeters.1, the whole bundle of new wire, the surface of the package will have a line of labels, clearly labeled wire brand, model, diameter (the number of square of the wire), see the figure below.2, some of the big brands of wire in the insulation layer is printed with the brand, model, diameter (the number of square of the wire).3, for the unlabeled wire , experienced electricians can visually, see the number of square wires. 4, inexperienced people, if you want to judge the thickness of the wire (square), the vernier ruler can be used to measure the diameter of the wire, and then find out the cross-section. If you want to judge the thickness of the wire (square), the vernier ruler can be used to measure the diameter of the wire, and then find the cross-section cross-section formula: S = radius of the square R? × π (R is the radius of the wire) For example, a wire with a diameter of 1.76 is 1.76 ÷ 2 × 3.14 = 2.76 square ≈ 2.5 square, (to take an approximate value). If you are to choose the size of the wire, generally based on the power size of the appliances to calculate the current, and then according to the current in the electrician's manual can be checked, so it is more accurate. If it is a single-core can measure its diameter, and then the radius according to the area of the formula S = radius * radius * 3.14 can know the cross-sectional area of the wire, and some lines are twisted together by a combination of multiple cores, so that can not be used in a single-core method to count, can only be based on the wire in which one of the multiple lines to pick up a single-core line, and then multiplied by the number of strands of wire can be. The formula is S = radius * radius * 3.14 * N, where N is twisted into the number of this wire! Wire and cable square calculation generally speaking, the empirical load is when the grid voltage is 220V, the empirical load per square of wire is about one kilowatt. Copper wire can carry 1-1.5 kilowatts per square, and aluminum wire can carry 0.6-1 kilowatts per square. Therefore, one square of copper wire is sufficient for an appliance with a power of one kilowatt. Specific to the current, short distance power supply general copper wire per square can carry 3A to 5A current. Heat dissipation conditions are good to take 5A / square millimeter, not good to take 3A / square millimeter. Conversion method: know the square of the wire, calculate the radius of the wire with the circular area of the formula: the number of square wires (square millimeters) = circumference (3.14) × wire radius (millimeters) of the square to know the square of the wire, calculating the diameter of the line is also the same way, such as: 2.5 square wires of the wire diameter: 2.5 ÷ 3.14 = 0.8, and then open the square to arrive at the 0.9 millimeters, so the 2.5 square wire of line diameter is: 2 × 0.9 mm = 1.8 mm. Know the diameter of the wire, the calculation of the square of the wire is also used to find the circular area of the formula to calculate: the square of the wire = circumference (3.14) × line diameter of the square / 4 cable size is also nominalized by the square, multi-stranded wire is the sum of the cross-sectional area of each wire. The formula for calculating the cross-sectional area of the cable: 0.7854 × wire diameter (mm) square × number of strands such as 48 shares (0.2 mm diameter of each strand of wire) 1.5-square line: 0.7854 × (0.2 × 0.2) × 48 = 1.5 square wires square number and the current conversion relationship between the safety of the 2.5 mm2 copper power line load capacity - - 28A. 4 mm2 copper power line safe flow - -28A. -Safe ampacity of 4 mm2 copper power cord - 35 A. Safe ampacity of 6 mm2 copper power cord - 48 A. Safe ampacity of 10 mm2 copper power cord - 65 A. Safe ampacity of 16 mm2 copper power cord - 1.5 mm2 --Safe ampacity of copper power cord of 16 mm2 - 91 A. Safe ampacity of copper power cord of 25 mm2 - 120 A. In case of aluminum cord, the diameter of the cord should be taken as 1.5 mm of that of the copper cord. In case of aluminum wire, the wire diameter should be 1.5-2 times of the copper wire. If the current of copper wire is less than 28A, it is safe to take 10A per square millimeter. If the current of copper wire is more than 120A, take 5A per square millimeter.

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