induced heating in switchboards

[koruma]

In the company where I work we are designing a switchboard that has a busbar for a current of 5000 A (AC); due to the physical design, the three phases are enclosed by a frame of sheet iron, and neutral and earth are outside this frame.
Since this design can produce heating in the iron structure, someone had the idea of interrupting the magnetic flux by intercalating one beam of stainless steel in the forementioned frame, I have heard this is effective using non-ferrous material, like copper or bronze, but not stainless steel, I would like to know your opinion on this matter.

 

[electricuwe]

There a three advantages of using stainless steel:

doesn't collect magnetic flux

lower hysteresis losses

lower conductivity leading to lower eddy current losses

In your case one beam of stainless steel will avoid heating due to currents in the neutral or ground conductor. If you want to avoid heating for balanced three phase currents too, manufacture the whole frame from stainless steel (if this is nessesary depends on distance of phase condcutor one from another and from phase conductor to frame).