电气安装导线连接坚固，接头不受拉力，包扎严密，采用螺钉（螺帽）连接时，电线无绝缘距离不大于3mm，铜线间连接应用压接或绞接法，绞接长度不小于5圈，裸露电线必须先用防水胶带包扎后再黑胶布，无绝缘层破损等缺陷经检验认可。
The electrical installation wires shall be firmly connected, the joints shall be free from tension and tightly wrapped. When the screws (nuts) are used for connection, the non insulation distance of the wires shall not be greater than 3mm. The copper wires shall be connected by crimping or stranding method, and the stranding length shall not be less than 5 circles. The exposed wires must be wrapped with waterproof tape before black tape, and no defects such as damage of the insulation layer shall be inspected and approved.