Lisäjohdin

Lisäjohdin, often translated as "auxiliary conductor" or "additional conductor" in English, refers to a conductor in an electrical system that is not part of the primary circuit for power transmission. Its purpose is typically to facilitate other functions within the system.

Common applications for lisäjohdin include control circuits, signaling, or communication lines that run alongside power conductors. For example, in a motor control panel, separate lisäjohdin might carry signals from the control buttons to the motor starter or transmit feedback signals from the motor back to the control system. They can also be used for protective grounding or bonding purposes in specific installations, although dedicated protective conductors are more common for safety grounding.

The use of lisäjohdin helps to separate different functions within an electrical installation, improving reliability and simplifying troubleshooting. By keeping control and power circuits distinct, interference between them is minimized. The sizing and type of lisäjohdin are determined by its specific function, the voltage and current it carries, and relevant electrical codes and standards. In some cases, these conductors may be integrated within a larger cable bundle or installed separately depending on the installation requirements and environment.