Indiana Code Title 22. Labor and Safety § 22-13-2-3

Sec. 3. (a) The rules adopted under section 2 of this chapter take precedence over:

(b) State agencies and political subdivisions may incorporate the rules adopted by the commission by reference into a rule, ordinance, or other regulation.  Notwithstanding IC 4-22-9-6, a reference to the rules adopted by the commission, by citation to the Indiana Administrative Code (IAC), shall be construed to include all amendments as of the date that the reference is written and any later amendments to that provision, unless accompanied by a reference to a specific edition or supplement to the Indiana Administrative Code.

(c) A city, town, or county may not adopt an ordinance that conflicts with or includes more stringent or detailed requirements than the commission's rules.