Patent ID: 8642900

Claim:
An electromagnetically shielded enclosure comprising: (a) a continuously-welded shell having a top, a bottom, and a plurality of side walls cooperating to enclose an interior volume, the interior volume sized to receive electronic equipment and allow human entry, the continuously-welded shell constructed from electromagnetically conductive materials and including welds along seams joining the side walls, the top, and the bottom; (b) at least one sally port located at least partially within the shell, the at least one sally port including a first door in one of the plurality of side walls and constructed from electromagnetically conductive materials and a second door constructed from electromagnetically conductive materials, the sally port defining a secondary interior volume within the continuously-welded shell and including an intermediate shielded interior volume sized to allow human entry through one of the first and second doors such that at least one of the first and second doors remains closed; and (c) an electrical connection sufficient to ground the continuously-welded shell to a reference ground, wherein the continuously-welded shell is otherwise isolated from ground by a nonconductive pad.