An electrical connection assembly comprising a wire assembly and a backshell assembly for a bulkhead electrical connector, the backshell assembly comprising: a lug comprising a first radially inward lug surface, a second radially inward lug surface, and a radially outward lug surface, wherein the first radially inward lug surface is conical, the second radially inward lug surface i is threaded, and the radially outward lug surface is threaded, wherein the first radially inward lug surface and the second radially inward lug surface together define a central lug bore, wherein the lug is configured to be coupled to the bulkhead electrical connector via the second radially inward lug surface; Z a nut comprising a shoulder and a radially inward nut surface, wherein the nut defines a central nut bore, wherein the nut is configured to be coupled to the lug via engagement between the radially inward nut surface and the radially outward lug surface; and a ring comprising a radially outward ring surface and an axially outward edge, wherein the radially outward ring surface is conical and the ring defines a central ring bore, wherein the ring is configured to be retained by the nut at least partially within the central lug bore; wherein electromagnetic shielding of the wire assembly to be coupled to the bulkhead electrical connector is configured to be electrically grounded to the bulkhead electrical connector via the backshell assembly; wherein at least a portion of the electromagnetic shielding of the wire assembly is configured to be disposed and compressed between the radially outward ring surface and the first radially inward lug surface; characterized in that the portion of the electromagnetic shielding is also disposed and compressed between the shoulder of the nut and the axially outward edge of the ring. a lug comprising a first radially inward lug surface, a second radially inward lug surface, and a radially outward lug surface, wherein the first radially inward lug surface is conical, the second radially inward lug surface i is threaded, and the radially outward lug surface is threaded, wherein the first radially inward lug surface and the second radially inward lug surface together define a central lug bore, wherein the lug is configured to be coupled to the bulkhead electrical connector via the second radially inward lug surface; Z a nut comprising a shoulder and a radially inward nut surface, wherein the nut defines a central nut bore, wherein the nut is configured to be coupled to the lug via engagement between the radially inward nut surface and the radially outward lug surface; and a ring comprising a radially outward ring surface and an axially outward edge, wherein the radially outward ring surface is conical and the ring defines a central ring bore, wherein the ring is configured to be retained by the nut at least partially within the central lug bore; wherein electromagnetic shielding of the wire assembly to be coupled to the bulkhead electrical connector is configured to be electrically grounded to the bulkhead electrical connector via the backshell assembly; wherein at least a portion of the electromagnetic shielding of the wire assembly is configured to be disposed and compressed between the radially outward ring surface and the first radially inward lug surface; characterized in that the portion of the electromagnetic shielding is also disposed and compressed between the shoulder of the nut and the axially outward edge of the ring.