30 CFR § 75.705-6
Protective clothing; use and inspection.
All persons performing work on energized high-voltage surface lines shall
wear protective rubber gloves, sleeves, and climber guards if climbers are
worn. Protective rubber gloves shall not be worn wrong side out or without
protective leather gloves. Protective devices worn by a person assigned to
perform repairs on high-voltage surface lines shall be worn continuously from
the time he leaves the ground until he returns to the ground, and, if such
devices are employed for extended periods, such person shall visually inspect
the equipment assigned him for defects before each use and, in no case, less
than twice each day.