檢視三相四线的原始碼

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|<center><img src=https://img2.baidu.com/it/u=1680647313,160163722&fm=253&fmt=auto&app=138&f=PNG?w=500&h=190 width="300"></center>
<small>[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E4%B8%89%E7%9B%B8%E5%9B%9B%E7%BA%BF&step_word=&hs=0&pn=32&spn=0&di=7077213605308923905&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3708975309%2C443056428&os=2840724896%2C3466641495&simid=3708975309%2C443056428&adpicid=0&lpn=0&ln=1631&fr=&fmq=1651388271652_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fimg.wendangwang.com%2Fpic%2Fd22d7e74184cf99eedc1fec9%2F2-339-png_6_0_0_0_0_0_0_892.979_1262.879-893-0-0-893.jpg%26refer%3Dhttp%3A%2F%2Fimg.wendangwang.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1653980302%26t%3D4f5bf008a44c1d92aa12a365fb3c3d45&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bojg1wg2owg2_z%26e3Bv54AzdH3F15vAzdH3F1dd10j098b9vulljj1v8ujvlAzdH3Fd&gsm=23&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCwyLDgsNCwxLDMsNiw1LDcsOQ%3D%3D 来自 呢图网 的图片]</small>
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中文名；三相四线

组成；三根火线、一根零线

电压；相电压220V、线电压380V

接法；星形接法及三角形接法
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'''三相四线'''是指由三根[[火线]]和一根零线组成的接线方式。其联接有星形接法及三角形接法两种，一般采用星形联接方法。三相对称电源是指能够提供三个大小相等，频率相同、相位互差120°的电动势(或电压)的交流电源。由三相电源供电的[[电路]]称为三相电路。<ref>[https://www.zhihu.com/question/34771304 如何理解三相四线制和三相五线制?],知乎 , 2015年12月16日</ref>