Copper core cable carrying capacity details

First, the relevant wire and cable capacity-carrying instructions

1. Current-carrying capacity: under the specified conditions (laying conditions; temperature conditions), the maximum current that the conductor can carry (not short-circuit) continuously without stabilizing the temperature (too high and then burned) to exceed the specified value (the maximum temperature of the insulator) .

2. Insulation material: The material attached to the outside of the copper core cable, generally PVC (polyethylene), XLPE (cross-linked ethylene), EPR (ethylene-propylene compound paste), minerals, etc.

3, the standard section of the general copper core cable specifications (mm): 0.3; 0.5; 0.75; 1; 1.5; 2.5; 4; 6; 10; 16; 25; 35; 50; 70; 95;

Second, the general copper cable carrying capacity regulations

According to the allowable maximum core temperature, cooling conditions, laying conditions to determine, under different conditions of the ampacity is completely different.

The current carrying capacity of the aluminum core and the copper core cable can be calculated based on the section, and the cross-sectional area of ​​the aluminum core of the copper conductor can also be calculated based on the current.

Third, the factors affecting the copper core cable carrying capacity

1, the ambient temperature

The ambient temperature value used is the temperature of the surrounding medium when the cable or conductor under consideration is not loaded.

2, soil thermal resistance

For cables buried in the ground, where the actual soil thermal resistance is higher than 2.5 Km/W, the current carrying capacity must be properly reduced or replaced with a more suitable material in the soil immediately surrounding the cable.

3, multi-loop group

When installing more wires or cables in the same group, it must be multiplied by the specified correction factor. The group correction factor is calculated on the assumption that the loop load of the cables in the group is the same.

4, the number of loaded conductors

The number of conductors to be considered in one loop is the number of conductors carrying the load current. It is not necessary to consider the neutral line when it can be assumed that the conductors in the polyphase loop carry balanced currents. When the neutral line carries current and the phase line load is not reduced accordingly, the neutral current should be taken into consideration when determining the loop current rating. Wires that are only protective wires (PE wire) should not be considered. The PEN line should be considered as a neutral line.

Due to its conductivity and economical applicability, copper core cables have gradually replaced aluminum core cables in the current industry and home, and have become mainstream in the market. Copper core cables are ideally suited for current industrial cabling and home use in terms of copper core cable current carrying capacity and other media current carrying capacity.