As I see it, there are at least three alternatives open to you.
Virtually all federal institutions are covered by OSHA. OSHA has adopted the NEC, and also has it's own rules regarding trainind and wualifications of help. While "qualified" is largely in the view of the employer, the employer is also expected to document any training provided.
You did mention a "shop steward." This guy's job is to address such issues, without it being necessary for you to make youself a target by opppenly questioning a policy. Since the steward is also an electrician, he should have some interest in this issue as well. If his steward duties interfere with his ability to do his job- well, there is already extensive labor law on this point, and he has remedies available to him.
Ultimately, you may file a grievance, and force the issue to be addressed. You also may approach management higher up the ladder.
You may also "vote with your feet," and seek employment elsewhere. Lose benefits, lose seniority, lose pay....look for sympathy elsewhere; that's what everyone else is face with on a regular basis. You, quite simply, have to "put up or shut up" in life sometimes.
I also very strongly reccomend that you be absolutely certain that your concerns are reasonable. There is a world of difference between changing a light bulb and installing a generator- yet both might be described as "electric work."
