Except as provided in § 1915.51(c)(3) of this part, whenever an employee is working alone, such as in a confined space or isolated location, the employer shall account for each employee:
Throughout each workshift at regular intervals appropriate to the job assignment to ensure the employee's safety and health; and
At the end of the job assignment or at the end of the workshift, whichever occurs first.
The employer shall account for each employee by sight or verbal communication.
[76 FR 24702, May 2, 2011]