Definition 1: A wire that is made of one or more mutually insulated conductors and an outer insulating protective layer that transmits power or information from one place to another.
Definition 2: Usually a rope-like cable formed by twisting several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and is often twisted around a center. There is a highly insulating cover. The cable has the characteristics of being energized inside and insulated outside.
classification
Cables include power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and so on. They are composed of single or multiple strands of wires and insulating layers, which are used to connect circuits and electrical appliances.
Cables can be divided into DC cables and AC cables according to the system of photovoltaic power plants. According to the different usage and use environment, they are classified as follows:
1. DC cable
(1) The serial cable between the module and the module.
(2) Parallel cables between the strings and between the strings and the DC distribution box (combiner box).
(3) The cable between the DC distribution box and the inverter.
The above cables are all DC cables, which are laid out in many places and need to be protected from moisture, exposure to sunlight, cold, heat, and ultraviolet rays. In some special environments, they also need to be protected from chemicals such as acid and alkali.
2. AC cable
(1) The connecting cable from the inverter to the step-up transformer.
(2) The connecting cable from the step-up transformer to the power distribution device.
(3) Connecting cables from the power distribution device to the power grid or users.
This part of the cable is an AC load cable, and there are many laying in the indoor environment. It can be selected according to the general power cable selection requirements.