The IP69K rating is for applications where high pressure and high temperature wash down is used to sanitize equipment. Improved version of SS boxes were introduced with double lip and double gasket to meet IP69K requirement.
Mild steel boxes have a high finish and are very solid. They will represent and reflect the quality of the machinery of the OEM in a convincing manner. The boxes can be fitted out with a large variety of different inserts so you can custom build your enclosure to any need. See for instance the DB2 system that is easy to mount for your convenience.
A series of type tested bus bar holders made out of extremely strong and self extinguishing material – The bus bars do not rely on bolts but slide in their holders offering minimum resistance during expansion or contraction of the copper