The original design capacity of transmission lines in many areas can not meet the actual demand. In order to save the cost, some users directly connect a cable with the same specification and section on the original transmission line to meet the actual demand of power consumption.
Theoretically, when two cables of the same specification and section are connected in parallel, the branch current of the two cables is the same. At this time, the carrying capacity of the transmission line can reach twice of the original line, so this method should be feasible.
It is not feasible to parallel a cable of the same specification and section in practice. The reasons are as follows:
1. Even if the same cable manufacturer produces cables of the same specification in different periods, the possibility of having the same cross-sectional area is relatively small. The resistance of the cable varies with the cross-sectional area.
2. When two cables of the same specification are laid in parallel, they are often without tension. Therefore, it is impossible to ensure that the cables are absolutely straight and their length cannot be completely consistent. Different cable lengths will also cause different cable resistance values.
3. The conductor of two cables may be in poor contact or loose at the joint, and the contact area can not be completely consistent, which will also make the resistance of the two cables different.
It can be seen that for two parallel cables, due to the different resistance, the current distribution of the two cables will be inconsistent in the actual use process. In the case of the same voltage level, one of the current may be larger. Because the heat generated by the cable is directly proportional to the square of the current, under the condition of full load operation, the cable with larger current may have thermal breakdown.
Therefore, parallel use of the same specification of cable there are certain hidden dangers, it is not recommended to use this method.
AS/NZS 3560.1 Aerial Bundle Cable (ABC) XLPE Insulated Standard: AS/NZS 3560.1 Conductor: Aluminum Insulation: XLPE Cores: single/ multi cores Origin: China
2 2 2 4 Direct Burial Aluminum (URD) Wire Standards: IEC/ASTM/BS/NFC/CSA/EN Voltage: 0.6/1kV Conductor: AAC/AAAC/ACSR Insulation: XLPE/PVC Origin Place: China
BS 7870 Standard ABC Cable Aerial Bundled Cable Standard: BS 7870 Conductor: Aluminum Insulation: XLPE Cores: single/ multi cores Origin: China
Power Cable Single Core /3 Core 16-300 mm2 Standards :IEC/ASTM/BS/NFC/CSA/EN Voltage: 0.6/1kV Conductor: Aluminum /Copper Armour: Steel Tape /Steel Wire Insulation :XLPE/PVC Core Number: 1-5 C Origin Place: China
Our customers have covered more than 50 countries. Export regions include Europe, North America, North Africa, Middle East, Southeast Asia, etc.
We certificate by ISO 9001:2015,ISO 14001:2015,OHSAS 18001 ,CCC Certificate ,UL certificate and so on.
We provide seaworthy cable packing, wooden drum/wooden-steel drum/ steel drum and etc, cable length can be designed according to customer needs.
We have a complete quality control system, advanced laboratory equipment, to ensure that every batch of goods sent to customers meets the quality requirements. Meanwhile, we accept testing requirements from customers and third-party testing agencies.
We believe that an excellent professional team is the best guarantee for quality service !