External Lightning Protection System Lecture 2: Protection angle method 

Sure will try to upload.

Many thanks

Thanks. Yes, it is infact very simple with autocad, however, many don't have ready access with them so manual calculations become helpful in that case.

Typically, we assume some value and try. If results don't satisfy then increase accordingly. During first iteration you shall select 1m higher than the highest point on that level. For example if you have HVAC outdoor equipment of height 2m then choose 3m. If value doesn't satisfy then try to place the rods on parapet or concrete block to raise the height rather than just increase copper to be economical.

Thanks. Yes it's true. Here I tried to present a generalised case.

You messed up the calculation 😕

Kindly check the reference angle you might have taken while doing your calculations. Base and perpendicular are not dependent on what the figure looks like but on the reference angle considered.

@@railwayengineeringinsights6463 Right sir 👍

It depends on reference angle which you have considered. In this 54 deg is considered so we can consider BC as perpendicular and AB as base. If your angle is /_ACB then AB is perpendicular and BC base.

@@sahilbhagat4356 yes 😐 my reference angle was at other side 😅

@@sahilbhagat4356 thanks for quick correction

It depends on reference angle which you have considered. In this 54 deg is considered so we can consider BC as perpendicular and AB as base. If your angle is /_ACB then AB is perpendicular and BC base. I hope you got an understanding of the method and video helped you.