How many square millimeters of the cross-section of a photovoltaic cable is better?

Answer 1

A few squares is a nominal value stipulated by the national standard, and a few squares are the user's choice of wire and cable according to the load of the photovoltaic cable. The number of squares of photovoltaic cables is a verbal term used in the renovation of hydropower construction. The number of squares of photovoltaic cables that are often said is no unit, that is, square millimeters. The square of the wire actually refers to the cross-sectional area of ​​the wire, that is, the area of ​​the circular cross-section of the wire, in square millimeters.

Inexperienced people, if you want to judge the thickness (square) of the wire, you can use a vernier to measure the diameter of the wire, and then find the cross-section. If you want to judge the thickness (square) of the wire, you can use a vernier to measure the diameter of the wire, and then find the formula for calculating the cross-section: S = the square of the radius R??×π (R is the radius of the wire) such as a wire with a diameter of 1.76, That is 1.76÷2×3.14=2.76 square ≈ 2.5 square, (take an approximate value). If you want to choose the size of the photovoltaic cable, you usually first calculate the current according to the power of the electrical appliance and then check the electrician's manual based on the current, which is more accurate. If it is a single-core, you can measure its diameter, and then get the radius. According to the formula of area S=radiusradius3.14, you can know the cross-sectional area of ​​the photovoltaic cable, and some wires are twisted together by a combination of multiple cores. Yes, in this way, you can't use the single-core method to calculate, you can only calculate by connecting one of the multiple wires in this wire to the single-core wire, and then multiply it by the number of strands of the wire.