First, the cable selection of relevant standards and norms

　　1、DL/T5044-2004 Power Industry Standard of the People's Republic of China

　　2, GB50217 power engineering cable design specifications

　　Second, the main technical requirements

　　1, DC power supply circuit should be used two-core cable, when necessary, single-core cable can be used.

　　2, high temperature above 100 ℃ or low temperature -20 ℃ below the place should not use PVC insulated cable.

　　3、Directly buried cable laying, when the cable is under great pressure or there is a danger of mechanical damage, steel belt armored cable should be used.

　　4, the maximum operating current under the action of the cable core temperature, shall not exceed the permissible value determined by the service life of the cable.

　　5, to determine the cable sustained permissible flow-carrying ambient temperature, if the cable is laid in the air or cable trench, should take the average of the highest temperature of the hottest month day.

　　Third, the choice of cable path should be consistent with the following provisions

　　1, to avoid the cable from mechanical external forces, overheating, corrosion and other hazards.

　　2, to meet the safety requirements under the conditions of the cable shorter.

　　3, easy to lay, maintenance.

　　4, to avoid places that will be excavated for construction, the cable in any laying method and all the path conditions of the up and down, left and right to change the components should meet the cable allowable bending radius requirements.

　　Fourth, photovoltaic power generation system cable types, features and laying methods

　　1、Photovoltaic special cable

　　String to the convergence box of the cable is generally used for photovoltaic cable PV1-F1 * 4mm2. photovoltaic cable structure is simple, the use of polyolefin insulation material has excellent heat, cold, oil, ultraviolet resistance, can be used in harsh environmental conditions, with a certain degree of mechanical strength.

2、Power cable

　　1）Steel-belt-armored flame retardant cross-linked cable ZRC-YJV22

　　Widely used in: convergence box to DC cabinet, DC cabinet to inverter, inverter to transformer, transformer to distribution unit connection cable, distribution unit to grid connection cable.

　　2）Power cable NH-VV

　　NH-VV copper core PVC insulated PVC sheathed fire-resistant power cable.

　　3、Control Cable

　　ZRC-KVVP copper core PVC insulated PVC sheathed braided shielded control cable. Suitable for AC rated voltage 450/750V and below control, monitoring circuits and protection lines.

　　4、Communication cables

　　1) DJYVRP2-22 polyethylene insulation PVC sheath copper braided shield armored computer flexible cable, suitable for rated voltage 500V and the following for the higher requirements of anti-interference electronic computers and automation connection cable.

　　2) RVVP copper core PVC insulated PVC sheathed insulated shielded flexible cable RVVP, also known as the electrical connection of anti-interference flexible cable, is suitable for alarms, security and other security needs to prevent interference in the safe and efficient data transmission of communication cables.

　　5、Radio frequency cable

　　Solid core polyethylene insulated polyvinyl chloride sheathed radio frequency coaxial cable SYV.