Here's some information that DeepSeek provided me with previously, which you can refer to. The scenario I was asking about was how to ground an indoor electrical system.
Achieving good grounding for a radio inside is a crucial but challenging task. The core objective of indoor grounding is not just to "protect against lightning" (which is largely ineffective because indoor grounding provides little protection against direct strikes), but more importantly, to provide a safe, low-impedance, and controllable return path for RF currents, thereby reducing interference, protecting equipment, and ensuring safe operation.
Unlike outdoor grounding rods, indoor grounding requires more sophisticated strategies. Please follow the following principles and methods:
Core principle: Safety first!
It is absolutely forbidden to directly connect the radio's ground wire to water pipes, gas pipes, or heating pipes. This is extremely dangerous and could cause electric shock or explosions.
AC "safely" does not equal "RF": The ground wire in a standard three-prong outlet is an electrical ground at 50 Hz, and its conductor length presents very high impedance to RF signals, making it unsuitable as an RF ground. However, it is essential for equipment safety. Our goal is to establish a dedicated RF grounding system that complements this.
The best solution: Establish a "single point grounding" system.
This is the most effective method for resolving issues related to radio frequency interference and grounding loops.
Choose a grounding point: Select a location near the radio equipment (such as under the operating table) and designate it as the "star-shaped grounding connection point".
Grounding Bus: Install a thick, short copper plate or wide copper strip (e.g., a 25mm wide, 2mm thick purple copper strip) as the common grounding bus. Securely mount it to the wall or desk back.
Star topology:
Use as short and thick a wire as possible (we recommend using multi-strand woven copper tape instead of single-core wire) to connect the radio, antenna tuner, and power supply's chassis ground terminal to this ground bus.
Also connect the metal casings of computers and other peripherals to this mainboard.
Key point: All devices should be connected individually to the bus, and not connected in series before being grounded.
Connect to the real-world location of the building:
This is the most important step. Starting from the grounding bus described above, use a single wire that is as short, straight, and thick as possible (such as a multi-strand copper wire or strip with a cross-sectional area of at least 6 square millimeters), to connect it to the main grounding point of the building, or to the grounding rod you have installed outdoors.
How to find it? The main grounding wire for a building is usually located near the electrical panel. If you cannot find it or connect, consider running a wire from outside to a grounding rod.
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