What would be the size of copper bus bar for 1600 amps capacity?

What would be the size of copper bus bar for 1600 amps capacity?

1260 mm square i believe.

1260mm square should be its area
with standard bus bars you can make up in any way
for ex:: 30x10mm – 5 nos(per phase)
45x15mm – 2 nos(per phase)
the size shall be half for neutral