The magnetic cores (also called toroids) must be inserted before making the joints. The toroid position along the cable section of the joint hole is irrelevant. After making the joints, the toroids can no longer be extracted and the shielding cables are installed. In general four shielding cables are positioned for every source cable. The length of the shielding cables must be equal to the joint hole. The shielding cables must be positioned symmetrically, the minor, unavoidable asymmetries due to installation do not affect shielding efficiency at all.
Toroids on the three phases.
Start of the shielding cable positioning stage.
Shielding cables near the HV cable joint.
Shielding cables installed on all HV cables. Positioning of the shielding cables is secured by plastic covered metal straps to withstand corrosion.
Flexible headers. The shielding cables must be connected at the ends of the joint hole with headers (also called star points). These components must have sufficient flexibility to connect all shielding cables to them in a simple manner.
Fixing the heat-shrink sheath between cable and header. The headers are also suitably insulated to withstand corrosion. Likewise, the connecting point between cable and header is protected by a heat-shrink sheath.
At the end of installation of the headers shielding is completed and appears as a strong and secure "armour" that assures reduction of magnetic fields like no other shielding is able to offer.