Abstract: A cable shield tunnel for an electrical device includes a ground bus and a floor shim, discrete from the ground bus, and coupled to a circuit card and forming a cable tunnel that receives an end of a cable. The ground bus includes an end wall extending along a first end of the cable tunnel, a first side wall extending from the end wall along a first side of the cable tunnel, and a second side wall extending from the end wall along a second side of the cable tunnel opposite the first side. The first and second side walls are configured to be coupled to the circuit card. The floor shim is provided at a second end of the cable tunnel opposite the first end and is positioned between the cable and the circuit card.