Okla. Stat. tit. 19, § 19-864.12: Manufacturers and assemblers

Manufacturers or assemblers of electrical equipment shall not be

subject to the provisions of this act in regard to any work involved

in the manufacture, test, alteration, maintenance or repair by the

manufacturers or assemblers of electrical materials, devices,

appliances or apparatus, except that nothing herein contained shall

exempt any manufacturer or assembler from compliance with any

applicable electrical installation code in his plant.