single core cable

What is a single core cable?

The single-core cable is a cylindrical metal strand. In a single-core cable, there is only one metalcore. Mainly copper or aluminum, but also a small amount of tinned copper.

Single-core cable information

Single-core PVC cable for household and construction site
Power cable for power transmission
There is no armored power cable in the power cable.
Or with SWA armored cable

A single-core cable means that there is only one conductor in an insulating layer. When the voltage exceeds 35kV and below, most of them use a single-core cable. The relationship between the core and the metal shield can be regarded as the relationship between the coil and the core in the primary winding of a transformer.

When the single-core cable core passes current, there will be a magnetic wire cross-linked aluminum package or a metal shield layer, so that the induced voltage is present at both ends.

Power cables generally consist of wires, insulation and a protective layer. Single, double and triple cable.

A single core means that there is only one conductor in an insulating layer. If it is used in a single-phase lighting circuit, two parallel paths are required. A double-core means that there are two conductors in one insulating layer, and only one is to be used in a single-phase lighting circuit. (The wire has multiple shares and single shares, and there are softcore and hardcore. According to the conditions of use and power selection, if you are not sure how to change the model, you can also Contact Us , our engineers will help you choose type)

Single-core cable specification

60227 IEC 01(BV)General-purpose single core hard conductor unsheathed cable
60227 IEC 02(RV) General-purpose single-core soft conductor unsheathed cable
60227 IEC 05(BV) Temperature resistant 70°C single core solid conductor unsheathed cable
60227 IEC 06(RV)Temperature resistant 70°C single-core soft conductor unsheathed cable
60227 IEC 07(BV-90)Temperature resistant 90°C single core solid conductor unsheathed cable
60227 IEC 08(RV-90)Temperature resistant 90°C single-core soft conductor unsheathed cable
60227 IEC 42(RVB)Flat non-sheathed cord

Single-core cable size

The calculation of the size of a single core cable.

S=0.25πD²(S: Cross-sectional area,π≈3.14,D: diameter)

Conductor cross-sectionConductor constructionOuter diameter intervalInsulation thicknessCu weightCable weight(about)
mm²n x mmmmmmkg/kmkg/km
0.51 x 0.801.9-
0.751 x 0.952.1–
11 x 1.132.2–
1.51 x 1.382.6-3.20.714.420
2.51 x 1.783.2-3.90.824.031
41 x 2.263.6-4.40.838.446
61 x 2.704.1-5.00.857.665
107 x 1.355.6-06.71.096120
167 x 1.706.4-07.81.0153.6175
257 x 2.138.1-09.71.2240275
357 x 2.529.0-10.91.2336370
5019 x 1.8310.6-12.81.4480500
7019 x 2.1712.1-14.61.4672710
9519 x 2.5214.1-17.11.6912970
12037 x 2.0315.6-18.81.611521200
15037 x 2.2717.3-20.91.814401470

Single-core cable diameter

Single-core cable diameter calculation method.

D=√(4S÷π) (S: Cross-sectional area,π≈3.14,D: diameter)

Single-core cable images

Advantages and disadvantages of single-core cable

The single-core cable is composed of a layer of insulation extruded outside the conductor.

The benefits are cheaper and easier to install.

The downside is that the physical structure is simple and cannot withstand physical damage; it is not tensile and easy to break. In the actual installation, it is necessary to use pipeline protection and fixed installation in an indoor environment.

Single-core cable application

Suitable for electrical installation, fixed wiring or flexible connection of electrical appliances.

Single-core cables are commonly used in household cables, installation and use of construction site cables.

Single-core cable use

It is easier to use a single-core cable in the homeroom because the single-core cable has a certain strength, the threading is convenient, and the joint is simple.

Single-core cable current carrying capacity

Single-core cable rating

The load current is different in different environments. For example, the next form core PVC insulated cable

Single-core cable current capacity

Conductor area(mm²)Copper coreAluminum core

Single-core cable rating

Nominal Voltage: 300/500V, 450/750 V

Test Voltage: 2500 V

450V is the rated voltage of the cable, and 750V is the withstand a voltage test voltage of the cable.

Single-core cable installation guide

The impact of electric power

In order to prevent the action of electric power generated by the short circuit, the single-core cable must be firmly fixed with support of sufficient strength to withstand the electric power corresponding to the expected short-circuit current.

Special precautions for single-core cables in AC circuits

Cables should be armor-free or armored with non-magnetic materials. In order to avoid the formation of a circulating current, the metal shield should be grounded only at one point.

All wires in the same circuit should be placed in the same pipe, conduit or trunk, or wire clamps should be used to secure all phase conductors together unless they are made of non-magnetic material. When installing two, three or four single-core cables to form a single-phase loop, a three-phase loop or a three-phase and neutral loop, the cables should be in contact with each other as much as possible. The angle between the outer sheaths of two adjacent cables in all cases should not be greater than the diameter of one cable.

When a single-core cable with rated current greater than 250A must be installed close to the steel cargo bulkhead, the gap between the cable and the arm should be at least 50 mm. Cables belonging to the same AC circuit are laid out in a trilobal shape.

That is, the magnetic material should not be used in the same group of single-core cables. When the cable passes through the steel plate, all the wires of the same circuit should pass through the steel plate or the stuffing box together, so that there is no magnetic material between the cables, and the cable is the gap with the magnetic material should be no less than 75 mm. Cables belonging to the same AC circuit are laid out in a trilobal shape.

In order to make the impedance of a three-phase loop of a considerable length composed of a single-core cable having a conductor cross-section equal to or greater than 185 mm2 approximately equal, each phase should be indexed once at a gap of not more than 15 m. Alternatively, the cable can be laid in a trilobal shape.

When the cable laying length is less than 30 meters, it is not necessary to take the above measures.

Gram. When several single-core cables are used in parallel in each phase of the line, all cables should have the same path and an equal cross-section.

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