Follow this sequence to wire a 3-phase, 4-wire CT shorting terminal block:

Most diagrams show one side of the CT secondary (typically S2) connected to a common shorting bar. This bar is then tied to a single point of ground to prevent static voltage buildup. 4. Shorting Mechanism Placement

Always label your wiring clearly, check polarity (S1/S2), and never assume a terminal block is “just a connection point.” Treat it as the active safety device it is.

To eliminate this hazard, a dedicated is wired between the CT secondary and the connected instruments.