We want to have a LV SWGR with two sections (and a bus tie between two sections). Necessary requirement for One section is “800A, 50kA-1sec” , for the other is “2500A, 50kA-1sec”. What will be the sizes of busbars?

( The size of busbar for 2500A will be greater. So, short circuit strength will be greater than 50kA-1sec. but how much? )

could you please introduce the relative standards (IEC, IEEE, …)?

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