The ARCA IEC is the largest UL-listed NEMA 4X polycarbonate enclosure on the market. Made in the European IEC standard sizes, this enclosure is available up to 31.5 in. by 23.5 in. by 11.5 in. Its impact-resistant polycarbonate is a suitable enclosing alternative to steel, and it will not dent, rust, crack or bloom like steel or fiberglass; it is also easier to modify and weighs less than either.