Originally Posted by patc

No one is addressing one issue: your employer is changing your job description. Nothing inherently wrong with that, but not something that should be done casually.

First - is the position unionized, or do you have a signed contract with the employer? In either case, they may not be able to force you to change your job duties.

Secondly - why you? Can anyone else do these new tasks? Sometimes employers are more flexible if you also bring them a solution. If Bob can and wants to do the work instead of you, problem solved.

Finally, you always have the option of hunting for a new job - how is the local job market?