If the EUT has no FG, it says that the ground plane is not connected. If the earth is floating, through what path is the noise applied?

If the EUT has no FG, it says that the ground plane is not connected. If the earth is floating, through what path is the noise applied?

In a common-mode test where there is no FG connection, the noise passes through the inside of the EUT, is capacitively coupled between grounds, and flows to SG.