Reasonable planning and correct selection of photovoltaic cable laying method is one of the important aspects of cable design.
When laying the cable, according to the engineering situation, environmental conditions and cable specifications, quantity and other factors, and according to meet the requirements of reliable operation, easy maintenance and technical and economic rational principles to choose the appropriate laying method.
The laying of DC cables for PV power generation projects mainly includes direct burial sand mat brick laying, pipe laying, slot frame laying, cable trench laying, tunnel laying, etc. The laying of AC cables does not differ much from the general power system laying method.
DC cables are mostly used between PV modules, between string to DC sink box, between sink box to inverter, their cross-sectional area is small, large, usually the cable is tied along the component bracket or buried directly through the pipe for laying, in laying generally consider:
(1)Connecting cable between components and connecting cable between string and sink, as far as possible using the component bracket as the cable laying channel support and fixed, can to a certain extent reduce the role of the impact of environmental factors.
(2) cable laying force should be uniform and appropriate, should not be too tight, photovoltaic sites generally have a large temperature difference between day and night, should avoid thermal expansion and contraction caused by cable fracture.
(3) in the building surface of the photovoltaic material cable leads, to consider the overall beauty of the building, laying position should avoid laying cables in the sharp edges of walls and brackets, so as not to cut, grinding damage to the insulation layer caused by short circuit, or by shear force cut wire caused by a break. At the same time to consider cable lines by direct lightning and other issues.
(4) reasonable planning of cable laying path, reduce cross, as far as possible, combined laying to reduce the project construction process of earth excavation and cable usage.