“OSHA recognizes that some servicing operations must be performed with the power on”

Minor servicing or maintenance that is routine, repetitive and integral to the use of the equipment for production may be covered by alternate protection. As the interpretations on the OSHA website indicate, such effective protection can include stopping the machine using a control switch (not an energy isolating switch, just a control switch), if the switch is designed in accordance with good engineering practice, controls all the hazardous energy and is placed in the off position, and is under the exclusive control of the employee performing the task.