What is the load of 2.5 square wire? How to calculate it?

2.5 square wire is a wire that is often used in life, but what is the load of a 2.5 square wire? Is everyone aware? Understand the wire load, avoid the use of improper use in the process of using electricity to cause safety problems, let's follow the small series to understand the load of the 2.5 square wire.

A brief introduction to the definition of wire load:

Electric load The electrical power consumed by a consumer using electrical energy. The electrical load includes asynchronous motors, synchronous motors, various types of electric arc furnaces, rectifiers, electrolyzers, refrigeration and heating equipment, electronic instruments and lighting facilities. They are divided into various power users in the fields of industry and agriculture, enterprises, transportation, scientific research institutions, culture and entertainment, and people's lives. According to the different load characteristics of power users, the power load can be divided into various industrial loads, agricultural loads, transportation load and people's living power load. The load of the wire we often say verbally refers to the current that it can withstand. At present, 1KW is equivalent to 2A.

Calculation of wire load:

The degree of load on the wire is mainly dependent on the current and also on the voltage level. Under normal circumstances, the safe current capacity of 1 square millimeter below 50A is 6A, the safe current capacity of 50~100A current 1 square millimeter is 5A, and the safe current capacity of 1 square millimeter above 100A current is 2.5A. So many square copper cables can calculate the current. According to the three-phase alternating current formula: P = 1.732 * U * I * cos φ, cos φ is the power factor, select 0.8; this is the three-phase power calculation formula. Single-phase: P=U*I*cosφ, cosφ is the power factor, the power factor is 1 for the resistive load, and 0.8 for the inductive load. This BV wire is different from the BVR multi-strand soft copper wire. Of course, the load of the rubber cable YC is two. The rubber cable load is better than the plastic wire such as BV/BVR/RVV. That is to say, the outer insulation is different, which will also affect the load of the wire. Generally 2.5-square wire load is 2 kW, and rubber cable, the full load can reach 3 kW.

The safe current carrying capacity of the 2.5 square wire is 22A. Depending on the line voltage, 380V and 220V are commonly used, and their load carrying capacity is different:

1, 220V one-way AC: P = IUcos φ = 220 × 22 × 0.9 = 4.4kw
2, 380V three-phase alternating current: P = √ 3IUcosφ = 1.732 × 380 × 22 × 0.9 = 13kw