Final answer:
If an energy isolating device is not capable of being locked out, the employer should implement alternative measures to ensure employee safety.
Step-by-step explanation:
If an energy isolating device is not capable of being locked out, it means that there is no mechanism to physically lock the device in an off position. In the context of workplace safety, an employer's energy control program refers to a set of procedures and policies aimed at protecting employees from hazardous energy sources. If an energy isolating device cannot be locked out, it is important for the employer to implement alternative measures to ensure the safety of employees.