30 CFR § 77.704-6
Protective clothing; use and inspection.
All persons performing work on energized high-voltage surface lines shall
wear protective rubber lineman's 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.