A perspective from Ontario, Canada...like your NEC, our federal and provincial electrical codes do not mandate the need for a license in an industrial environment. What comes into play is our Occupational Health and Safety Act. Relatively simple electrical work - for example, a motor changeout - can be done by a "competent person". They have been instructed as to how to do the task safely, and the potential risks involved. The onus has been on the employer to provide such documented training. Up here, most facilities has found it less-burdensome to hire licensed electricians than to administer such a program. Liability and risk are the usual determining factors. As a licensed electrician for 30 years and a H&S rep for half that time, I have no qualms with providing the training or overseeing an unlicensed co-worker doing such work.