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I'm looking to get a medical-grade isolation transformer to eliminate ground loop issues in my PC/audio setup.

I understand that this type of transformer provides galvanic isolation and features hospital-grade outlets (with green dots) for the output, as well as an external grounding stud marked with the potential equalization conductor symbol (⏚).

My Question: If I connect my PC and monitor to the green-dot output outlets of the isolation transformer, do I also need to connect the external grounding stud to a clean earth ground? Or is everything already properly grounded through the 3-prong plugs alone?

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    \$\begingroup\$ Welcome! Sounds like an XY problem. Please draw a block diagram of your setup, including all signals and grounds. Generally, it's easier and cheaper to do the isolation on the signal side only. \$\endgroup\$ Commented May 19, 2025 at 12:08
  • \$\begingroup\$ is this diagram correct ? \$\endgroup\$ Commented May 19, 2025 at 12:20
  • \$\begingroup\$ That's not detailed enough. Where does the audio come in, where is it powered from and how is it grounded? \$\endgroup\$ Commented May 19, 2025 at 12:20
  • \$\begingroup\$ The audio interface is a PCIe sound card, installed directly inside the PC, not externally connected over USB or analog cables \$\endgroup\$ Commented May 19, 2025 at 12:23
  • \$\begingroup\$ Then again, break the ground loop there instead. Also, that in turn will be connected to something, which may be powered and grounded, which is missing from the block diagram. \$\endgroup\$ Commented May 19, 2025 at 12:31

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From the manufacturers website:

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All the grounds are connected.

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