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鞋厂车间配线导线截面确定方法
发布时间:2015-03-17 浏览:

工厂配线导线截面确定公式(供参考)

380V/220V三相五线制供电时

三跟相线,一跟零线,一跟地线

零线,地线为相同规格导线,截面为相线截面的35%

采用380v/220v供电时计算公式如下:

 

S=

 

 

P×L×100×2

 

 

R(380)2×△U%

S=导线截面(平方毫米)

P=用电设备的功率(瓦)

L=线路长度(米)

R=导线的导电率(铜线r=54/毫米2.欧,铝线r=32/毫米2.欧)

U%=允许的电压损失百分数,一般按5%计算

例如:P=110KW=110000W

L=150

U%=5%  采用铜芯线配线  则:

 

S=

 

 

110000×150×100×2

 

=84mm2

54(380)2×5

 

将此数据往高一层数字选用如:84mm2以上,查表则实际选用95mm2,则零线,地线截面为95×0.35=33mm2,查表数字往高一层则选用35mm2

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