Standard for the thickness of distribution boxes under national regulations According to national standards, the wall thickness of the low-voltage distribution box should not be less than 1. 5mm, and the metal auxiliary pole should be 1. stallation and use of boxes. The article includes table references that guide the electrician in the selection of the proper box size necessary to safely accommodate ele trical service requirements. Standard for the. Optional mounting feet available on FS, Suitable for use in wet locations whenused with gasket covers Cast iron is suitable for concrete use For use with FS-style covers see pages To order without mounting lugs, contact factory. CATALOG NUMBER KILLARK DURALOY ALUM. The body of the boxes shall have sufficient re- enforcement with suitable size of channels keeping a provision for fixin andle conforming to general. FS and FD Cast Device Boxes: Single Gang; Malleable Iron, Al xcellent service in areas where box of, raintight and dust-tight when used with cast ga ping from 1/2" thru er, 1993 Copyright pping: malleable iron or cop electroplate, (2) dichro-mate, and (3) a ound" ridge top of Appleton aluminum or. ABB Mini Center Compact distribution board is the basis for development and growth in meeting all the demands for a successful future in residential, commercial, and infrastructure segments. The wide range of distribution boards enables each customer to select an individual and economical.