I can't speak to any specific bargaining agreement, but I work at a non-union plant as an NLO and do stuff that any other NLO would do plus Elec, HP, Chem, Predictive, Maint related stuff.
Oh how I long for the place where I can do rounds, tests, and clearances and the other depts actually do their own work 100%.
I swear to the heavens that OPs at my plant bats clean-up.