Either side may be attached to the table (vertical coupling plane) or the floor surface (GND).

* The reason why the terminal positions differ between the square-case side and the conical-case side (the square case is nearby, and the conical case is about 20mm away) is that, when non-grounded equipment (products without grounding) has a metal enclosure, it must be connected to the horizontal coupling plane (GND) via the discharge resistor cable.

Under the standard, non-grounded equipment must be connected as close as possible to the EUT test location (less than 20mm), so in this case the terminal on the square-case side is connected to the non-grounded equipment side.