How To Calculate The XLPE Cable Diameter?

The core of the power cable is mainly composed of multiple wires, which are divided into single core, double core and three core. Among them, single-core cables are mainly used in single-phase AC and DC circuits, while three-core cables are mainly used in three-phase AC circuits. For single-core cables, the relationship between core diameter and cable diameter is relatively simple. Under normal circumstances, the core diameter is about 20% to 30% of the outer diameter of the cable. Therefore, we can estimate the size of the core diameter by measuring the outer diameter of the cable.

For three-core cables, because the three-phase current in the conductor will produce a magnetic field, it is necessary to take into account the space between the conductors and the effect of the insulation layer. Therefore, when calculating the outer diameter of the cable, factors such as the cross-sectional area of the conductor, the space between the conductors, and the thickness of the insulation layer need to be considered. Then how to calculate the outer diameter of the cable?

The following factors should be considered in calculating the outer diameter of the cable: the diameter of the conductor inside the cable (outer diameter of the conductor), the thickness of the insulation layer inside the cable, the thickness of the outer sheath of the cable, and the number of cable cores inside the cable. Combining the above factors, the following formula can be used to calculate the outer diameter of the cable line:

Outer diameter = Outer diameter of conductor +2 x insulation layer thickness +2 x sheath thickness

The outer diameter of the conductor can be obtained by inquiring the manual or measuring according to the specifications of the conductor. Insulation thickness and sheath thickness can be obtained by querying the cable specifications or measuring.It should be noted that the above formula applies to single-core cables, if it is a multi-core cable, it needs to be calculated according to the following formula:

Outer diameter = (outer diameter of conductor +2 x insulation layer thickness +2 x sheath thickness) x number of cable cores +10%