Patent ID: 7306483

Claim:
An electrical cord assembly comprising a cord and a socket; wherein the cord comprises a polygonal end having a free end face adjoined by at least one first pair of substantially parallel and substantially equal sides; and a second pair of substantially parallel and substantially equal sides such that only one of the two pairs of the polygonal end are equal when viewed at the end face; further along only one side of the polygonal end is a first keying element beginning at and perpendicular to the end face; wherein the first keying element is intersected by a channel which encompasses the perimeter of the polygonal end near the free end; and the socket comprises a complimentary polygonal opening which receives the polygonal end of the cord; the socket having a side which defines a second keying element; wherein the first keying element with the intersecting channel of the polygonal end receives the second keying element of the socket such that only one orientation produces an electrical connection.