Where does “проволочный” come from?

проволочный (Russian) comes from Russian про́волока, from Russian волочить, from Old East Slavic волочити, from Proto-Slavic volčiti.

проволочный (Russian): wire

Definitions

Step	Language	Word	Meaning
1	Russian	про́волока	—
2	Russian	волочить	to drag, to trail; to draw
3	Old East Slavic	волочити	—
4	Proto-Slavic	volčiti	—

проволочный — Etymology, Origin & Word History | Etymology Explorer