If more than one person is engaged in work on or about the same electrical equipment or lines at any one location, one of the persons shall be designated as the foreman locally in charge of the work; or workmen shall be instructed as to the work they are to perform, and the employe instructing the workmen shall be considered in charge of the work.
34 Pa. Code § 39.317
This section cited in 34 Pa. Code § 39.525 (relating to duties of foreman).