Cable Tray & Trunking 90 Degree Bend Formula: For the first time on KZread, the formula of how to make a 90 degree band between cable tray and cable trunking is given in Bengali. There are many videos on youtube on how to make 90 degree bands on cable trains and tanks but you won't find this formula anywhere else. With this formula you can make the correct measurement 90 degree band in any size cable tray or cable trunk. If you do electrical work then you need to know this formula for making 90 degree band. If you are just making bands on trays, ladder trays or trunks, you must use this formula to understand how much this formula benefits you. By using this formula you can make any 90 degree band as you need. In this video how to measure 90 degree band and how to measure 90 degree brand cutting is explained beautifully in Bengali. This is my own formula that I use to create 90 degree bands. I hope you can make any type and any size 90 degree band with this formula. It will be very useful in your work. How to make a 90 degree band is explained in detail in this formula in Bengali. If you want to get more videos like this in Bengali then definitely subscribe Electric House BD channel and press the bell so that the next video will reach you first.