No No, I'm just having a debate with a friend, I'm an electronics engineer, and do panel board assembly, in my design, I pick the highest rated current, multiply it by 2, then, add the other two rated currents:
19A 19A 11A
so I do this:
(19x2) + 19 + 11 = 68A
so I use and MCB 3x80A.
but I lack norm, I use this formula because I'm taught about it.
I just need some norm or regulation to follow.
Thanks for your concern Ragman