OSHA 1910.147(b) differentiates an affected employee to an authorized employee.
An affected employee is an employee whose job requires to operate or utilize a machine or piece of equipment on which lockout or tagout servicing or maintenance is being done, or to work in an area where such servicing or maintenance is being performed.
On the other hand, an authorized employee is a person who locks out or tags out machines or equipment so that servicing or maintenance can be performed on it.
When an affected employee's duties involve conducting service or maintenance covered OSHA 1910.147(b), that employee becomes an authorized employee.