yhdenfaasisen
Yhdenfaasisen is a Finnish adjective used to describe something related to a single electrical phase, typically a power supply or electrical system that operates on one phase rather than multiple phases. The form is encountered in technical texts to specify that a installation or device uses only one phase, as opposed to multi-phase arrangements such as three-phase systems.
In everyday Finnish, the term is infrequent and not part of the standard vocabulary. More common expressions
The usage of yhdenfaasisen tends to be limited to contexts where authors want to emphasize the single-phase
See also: single-phase power, three-phase power, electrical distribution, vaihe (phase) in Finnish technical vocabulary.