The Arca-IEC series of polycarbonate enclosures has been expanded to include three additional sizes: MP303021, which is 12 x 12 x 8 in; MP404021 at 16 x 16 x 8 in; and MP505021, which is 20 x 20 x 8 in. The enclosures offer high impact resistance (IK10) and an IP66 ingress protection rating that is UL-listed and rated NEMA 4X. Radio-transparent polycarbonate eliminates the need for an external antenna. The UV-stabilized polycarbonate construction eliminates denting, rusting, cracking and blooming.