我国每户住宅内照明和插座的分支回路数也不太多。由于分支回路少，每回路所带的负荷增大，实际等于减少了线路截面，其结果同样是线路温升的增加。我们知道线路载流量是指某一敷设方式和环境温度条件下线路在允许工作温度时通过的电流。此允许工作温度是相对于其正常绝缘寿命 China’s household lighting and socket outlets for each branch circuit is not too much. Due to the fewer branch circuits, the load brought by each circuit increases, which is equivalent to reducing the cross section of the circuit. The result is also an increase in the temperature rise of the circuit. We know that the current carrying capacity of a line refers to the current passing through the circuit under the allowable operating temperature under certain laying conditions and ambient temperature. This allows the operating temperature to be relative to its normal insulation life