Square D by Schneider Electric brand heavy duty safety switches are UL listed for use with accessories. This Solid neutral assembly is insulated, groundable and isused with E4 Series Heavy duty switches with ampere rating of 800A, could be factory or field installed. Terminal data for this assembly is (8) AWG 3/0-750 kcmil aluminium or copper plus (2) AWG 6-350 kcmil aluminium or copper for service ground