Pääsyöttöjohdin

Pääsyöttöjohdin, also known as the main supply conductor or service entrance conductor, is a crucial electrical component in a building's power distribution system. It refers to the wires that carry electricity from the utility's power source, typically an overhead line or underground cable, to the building's main electrical panel or service entrance. These conductors are designed to handle the full electrical load of the entire premises.

The sizing and material of the pääsyöttöjohdin are determined by local electrical codes and standards to ensure safe and reliable operation. They are usually made of copper or aluminum and are insulated to protect against environmental factors and potential short circuits. The main purpose of the pääsyöttöjohdin is to safely deliver a substantial amount of electrical power to the building, which is then distributed to various circuits by the main breaker and sub-panels.

Proper installation and protection of the pääsyöttöjohdin are essential to prevent electrical hazards such as fires, electrocution, and power outages. They are typically run in conduit or other protective raceways to shield them from physical damage. The connection point where the utility's service drops connect to the pääsyöttöjohdin is a critical junction, often secured by a meter socket and main disconnect switch. Any work on or near these conductors should only be performed by qualified electricians due to the high voltage and potential dangers involved.