Separation of low-signal, a noisy ground floor:

The TV channel, the recording studios and other installations where sound quality is very important that a special signal ground as a "technical ground" means (or "technical earth") are often installed to prevent hum loops. This is basically the same as an AC ground, but no device can not connect ground wires to it, because they can cause electrical interference. In most cases, the studios metal racks are joined together with heavy copper cable (or flattened copper pipes or rails) and similar compounds to achieve the technical progress.

Great care is taken that no grounded AC devices are placed on the shelves, as a single AC ground is the technical reason to destroy its effectiveness. For particularly demanding applications may be the main technical result of a heavy copper tube, if necessary, by drilling through several concrete floors, so that all technical reasons, the shortest path to a grounding rod fitted connected in the basement.