Panelboard Solderless Lugs,Type: PV ,500 -4 (2) AWG ,Al/Cu Rated. Panelboard Solderless Lugs,Type: PV ,500 -4 (2) AWG ,Al/Cu Rated. CMC® Panelboard connectors are manufactured from high strength 6061-T6 aluminum alloy to insureboth maximum strength and conductivity. They are dual rated for both copper and aluminum conductors and are electro tin plated to provide low contact resistance and protection against corrosion.