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An earthing system (UK and IEC) or grounding system (US) connects specific parts of an electric power system with the ground, typically the equipment's conductive surface, for safety and functional purposes. [1] The choice of earthing system can affect the safety and electromagnetic compatibility of the installation.
The primary reason for the use of isolated grounds (IG) is to provide a noise-free ground return, separate from the equipment grounding (EG) return. The EG circuit includes all of the metal conduit, outlet boxes, and metal enclosures that contain the wiring and must be grounded to provide a safe return path in case of fault currents.
Green ground wire with yellow stripe Symbol used to mark the Protective Earthing Conductor terminal of Class I equipment. Appliance class I is not only based on the basic insulation, but the casing and other conductive parts are also connected with a low-resistant earth conductor.
Grounding (metaphysics), a topic of wide philosophical interest; Grounding, a strategy for coping with stress or other negative emotions; Grounding in communication, the collection of mutual knowledge, beliefs, and assumptions; "common ground" Ground (electricity), a common return path for electric current
Lightning safety grounding (1) is covered in the following section, not here. The electrical safety ground (2) was discussed in previous sections and is unsuitable for radio purposes, although required for the power supply. The radio frequency ground (3) is the topic of this section.
A ground connection that is missing or of inadequate capacity may not provide the protective functions as intended during a fault in the connected equipment. Extra connections between ground and circuit neutral may result in circulating current in the ground path, stray current introduced in the earth or in a structure, and stray voltage.
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