Pääsyöttöjohdinta

Pääsyöttöjohdin, also known as the main supply conductor or service entrance conductor, is the electrical conductor that brings power from the utility's distribution system to a building's electrical service entrance. This is the point where the utility's responsibility for the electrical system ends and the building owner's responsibility begins. The size and type of the pääsyöttöjohdin are critical for safely and effectively delivering the required electrical load to the property. It is typically a heavy-gauge cable designed to carry the maximum expected current for the building.

The selection of the pääsyöttöjohdin is determined by several factors, including the total anticipated electrical load of the building, local electrical codes and regulations, and the distance from the utility's transformer. Undersized conductors can overheat, posing a fire hazard and leading to voltage drops that can impair the performance of electrical equipment. Oversized conductors, while safe, can be unnecessarily expensive. Electrical professionals, such as electricians and electrical engineers, are responsible for calculating the appropriate size and type of the pääsyöttöjohdin to ensure compliance with safety standards and efficient power delivery. The connection of the pääsyöttöjohdin to the utility's system is usually made at a meter base or a service head, depending on the installation.