看你的电工基础知识牢固吗？(6)

homestay

how many supports do you need for a 20 ft cable tray?

jack_lai

The question remains murky?
Firstly, the tray is metal tray or basket tray?
  H( [* }% V% l$ RIf it is metal tray.  The support I guess should be 3? I need check the code about this. Usually you just ask your foreman you can get the answer immediately

Allan2008

我们工作的20尺tray都是两点支撑的。

homestay

Different tray has different support requiement. the right answer is : as per manufactures description, minimum 2.