An employee was helping to install a guide wire for a high voltage 7620 volt line. He was holding onto the guide wire at ground level while a coworker in an elevated aerial lift was tightening the guide wire bolt. The coworker came into contact with a live wire bolt, which energized the guide wire that the employee had in his hand. Both of his toes suffered electrical burns, requiring hospitalization. PPE was not worn at the time of the incident.