Common installation and laying problems of 4mm² DC solar cable

With the development of the photovoltaic industry in recent years becoming more and more mature, people's awareness of ecological and environmental protection has gradually improved, and the requirements for the laying of cables and wiring construction in photovoltaic power plants have become more and more strict. Therefore, combined with practical work experience, the common installation of photovoltaic lines is Analysis of laying problems

The cable laying method shall be comprehensively considered according to the engineering conditions, environmental conditions, cable specifications, model, quantity and other factors, and shall be selected according to the requirements of reliable operation, easy maintenance and reasonable technical and economic principles.

DC solar cables are mostly used between photovoltaic modules, between strings and DC combiner boxes, and between combiner boxes and inverters. They have a small cross-sectional area and a large number. Usually, the cables are bundled along the module brackets or directly buried through pipes. When laying, generally consider:

(1) Connecting cables between components and connecting cables between strings and combiner boxes, using component brackets as channel support and fixation for cable laying as much as possible can reduce the effect of environmental factors to a certain extent.

(2) The force of the cable laying should be uniform and appropriate, and should not be too tight. Generally, the temperature difference between day and night in photovoltaic places is large, and the cable breakage caused by thermal expansion and cold contraction should be avoided.

(3) For the cable leads of photovoltaic materials on the surface of the building, the overall appearance of the building should be considered, and the laying position should avoid laying cables on the sharp edges of walls and brackets, so as to avoid short circuits caused by cutting and abrasion damage to the insulating layer, or cut off by shearing force The wire causes an open circuit. At the same time, problems such as direct lightning strikes on cable lines should be considered.

(4) Reasonably plan cable laying paths, reduce crossovers, and combine laying as much as possible to reduce the amount of earthwork excavation and cable consumption during project construction.