Introduction

 cab1Electrical cable is an assembly consisting of one or more conductors with their own insulations and optional screens, individual covering(s), assembly protection and protective covering(s). Electrical cables may be made more flexible by stranding the wires. In this process, smaller individual wires are twisted or braided together to produce larger wires that are more flexible than solid wires of similar size. Bunching small wires before concentric stranding adds the most flexibility. Copper wires in a cable may be bare, or they may be plated with a thin layer of another metal, most often tin but sometimes gold, silver or some other material. Tin, gold, and silver are much less prone to oxidation than copper, which may lengthen wire life, and makes soldering easier. Tinning is also used to provide lubrication between strands. Tinning was used to help removal of rubber insulation. Tight lays during stranding makes the cable extensible (CBA – as in telephone handset cords).

Cables can be securely fastened and organized, such as by using trunking, cable trays, cable ties or cable lacing. Continuous-flex or flexible cables used in moving applications within cable carriers can be secured using strain relief devices or cable ties.

At high frequencies, current tends to run along the surface of the conductor. This is known as the skin effect.

Solar Cable

 cab2Solar cable is the interconnection cable used in photovoltaic power generation. A solar cable interconnects solar panels and other electrical components in the photovoltaic system. Solar cables are designed to be UV resistant and weather resistant. It can be used within a large temperature range and are generally laid outside.

One common factor for most of the photovoltaic power systems is outdoor use, characterized by high temperatures and high UV radiation. Single-core cables with a maximum permissible DC voltage of 1.8 kV and a temperature range from -40°C to +90°C are generally used. A three-core AC cable is used for connection to the grid if a single-phase inverter is used, and a five-core cable is used for three-phase feed-in.

DC connection

 

Individual modules are connected using cables to form the PV generator. The module cables are connected into a string which leads into the generator junction box, and a main DC cable connects the generator junction box to the inverter. In order to eliminate the risk of ground faults and short circuits, the positive and negative cables, each with double insulation, are laid separately.

Loss minimization

The cross-section of the cables should be proportioned such that losses incurred in nominal operation do not exceed 1%. String cables usually have a cross-section of four to six square millimeters.

Type of cable

cab3

 

 

 

 

 

 

 

 

 

The photovoltaic conductor HIKRA® C meets the requirements of the German electrical commission (DKE). Because of the resistance to temperature and UV, it is deployed on the DC site for the wiring from solar modules, to the string boxes up to the inverter. Thanks to its good resistance to atmospheric conditions, the cable can be laid outdoor but not underground or in water.

HIKRA® C red

Order No.

No. of cores x cross-section
in mm²

Conductor construction
n x max-ø (mm)

External diameter approx. (± 0.2mm)

Copper quantity, kg/km

Weight, approx.
in kg/km

72 15 01

1 x 2,5

50 x 0.26

4.6

24.0

46

72 15 02

1 x 4,0

53 x 0.31

5.0

38.4

60

72 15 03

1 x 6,0

80 x 0.31

5.6

57.6

80

72 15 04

1 x 10,0

80 x 0.41

7.4

96.0

140

Back to top