Electric lines or cables used to transmit electricity (power cables), such as overhead power lines or in-house wiring.
高圧電線には近づかないでください。
Do not approach high-voltage power lines.
台風で電線が切れて停電になった。
A typhoon severed the power lines and caused a blackout.
住宅の配線工事で古い電線を交換した。
During the home's rewiring, the old cables were replaced.
Can also refer (in some contexts) to telephone or telegraph wires — communication lines rather than power lines.
家の電話は外の電線を通して接続されている。
The home's telephone is connected via the external telephone wire.
昔は電話が通じるために電線を引いたものだ。
In the past, people ran telephone wires to get phone service.