A pre-expanded cover assembly for protecting a cable splice connection including cables (40, 50) and a connector, the cables (40, 50) including electrical conductors (42, 52) surrounded by cable insulation layers (44, 54), the pre-expanded cover assembly comprising: (a) a splice body assembly including: a tubular, cold-shrinkable, electrically insulative, elastomeric splice body having an interior surface defining an interior passage; and a tubular layer of a conformable medium pre-mounted on the interior surface of the splice body, wherein the conformable medium is a flowable material having a dielectric constant of at least 10; (b) a removable holdout, wherein the splice body assembly is mounted on the holdout such that the holdout maintains the splice body in an elastically radially expanded state, and the holdout is selectively removable from the splice body to permit the splice body to elastically radially contract; and (c) a tubular faraday cage sleeve; wherein (i) the expanded tubular Faraday cage sleeve is mounted on the removable holdout and is radially interposed between the removable holdout and the conformable medium; (ii) the conformable medium is a mastic, (iii) the layer of the conformable medium is positioned over the tubular Faraday cage sleeve and configured such that, when the pre-expanded cover assembly is positioned adjacent the cable splice connection, the holdout is removed from the splice body, and the splice body elastically radially contracts onto the cable splice connection, the layer of the conformable medium will be radially interposed between and engage each of the interior surface of the splice body and an opposing interface surface of the cable insulation; and (iv) the splice body includes a tubular primary insulation layer formed of an electrically insulating elastomer, the primary insulation layer extending from a first axial end to an opposed second axial end, the interior passage terminates at the first and second axial ends (332A, 332B), and the tubular layer of mastic extends continuously from the first axial end to the second axial end. (a) a splice body assembly including: a tubular, cold-shrinkable, electrically insulative, elastomeric splice body having an interior surface defining an interior passage; and a tubular layer of a conformable medium pre-mounted on the interior surface of the splice body, wherein the conformable medium is a flowable material having a dielectric constant of at least 10; a tubular, cold-shrinkable, electrically insulative, elastomeric splice body having an interior surface defining an interior passage; and a tubular layer of a conformable medium pre-mounted on the interior surface of the splice body, wherein the conformable medium is a flowable material having a dielectric constant of at least 10; (b) a removable holdout, wherein the splice body assembly is mounted on the holdout such that the holdout maintains the splice body in an elastically radially expanded state, and the holdout is selectively removable from the splice body to permit the splice body to elastically radially contract; and (c) a tubular faraday cage sleeve; wherein (i) the expanded tubular Faraday cage sleeve is mounted on the removable holdout and is radially interposed between the removable holdout and the conformable medium; (ii) the conformable medium is a mastic, (iii) the layer of the conformable medium is positioned over the tubular Faraday cage sleeve and configured such that, when the pre-expanded cover assembly is positioned adjacent the cable splice connection, the holdout is removed from the splice body, and the splice body elastically radially contracts onto the cable splice connection, the layer of the conformable medium will be radially interposed between and engage each of the interior surface of the splice body and an opposing interface surface of the cable insulation; and (iv) the splice body includes a tubular primary insulation layer formed of an electrically insulating elastomer, the primary insulation layer extending from a first axial end to an opposed second axial end, the interior passage terminates at the first and second axial ends (332A, 332B), and the tubular layer of mastic extends continuously from the first axial end to the second axial end. (i) the expanded tubular Faraday cage sleeve is mounted on the removable holdout and is radially interposed between the removable holdout and the conformable medium; (ii) the conformable medium is a mastic, (iii) the layer of the conformable medium is positioned over the tubular Faraday cage sleeve and configured such that, when the pre-expanded cover assembly is positioned adjacent the cable splice connection, the holdout is removed from the splice body, and the splice body elastically radially contracts onto the cable splice connection, the layer of the conformable medium will be radially interposed between and engage each of the interior surface of the splice body and an opposing interface surface of the cable insulation; and (iv) the splice body includes a tubular primary insulation layer formed of an electrically insulating elastomer, the primary insulation layer extending from a first axial end to an opposed second axial end, the interior passage terminates at the first and second axial ends (332A, 332B), and the tubular layer of mastic extends continuously from the first axial end to the second axial end.