lineman, linesman, electrician - ( a person who installs or repairs electrical or telephone lines )
He might have told you he was a qualified electrician, but the truth is quite otherwise.
In August 1980, a 37-year-old electrician named Lech Walesa vaulted over the gate and rescued a faltering strike by shipyard workers, inspiring what soon would become known the world over as Solidarność.
The electrician has diagnosed a fault in the wiring.
You'd better get a qualified electrician to sort this out - you don't want any Tom, Dick or Harry messing around with your electrics.