maadoituspiste

Maadoituspiste, or grounding point, is a designated point in an electrical or electronic system where the protective earth conductor is connected to the earth. Its purpose is to establish a reliable earth reference and provide a low-impedance path for fault currents, lightning surges, and static discharge so that protective devices can operate and personnel are protected from electric shock.

In a typical installation, the maadoituspiste comprises an earth electrode or electrode system (such as a grounding rod or plate), a grounding conductor that runs from the electrode to the main distribution board or equipment, and a bonding network that connects the earth to protective earth (PE) terminals and metal structures. The main maadoituspiste is often located at the service entrance or main distribution cabinet, while additional local grounding points may exist for machinery, antennas, or telecom equipment.

Testing and maintenance focus on ensuring good electrical contact with the earth, continuity of the grounding conductor, and adequate low impedance to earth. Regular inspections check for corrosion, mechanical damage, paint or coatings that impair contact, and proper bonding to exposed conductive parts. Measurements typically assess earth resistance and overall grounding integrity according to national and international standards.

Maadoituspiste is a concept used in electrical installations, lightning protection, and some telecom or industrial systems. It is governed by applicable standards and regulations, such as those governing electrical safety, and may be referred to as the main grounding point or service earth in different contexts.