toolbbin
The qualified trainer scenario you are talking about is based on the premise that even though an electrician or an EE might have broad general training he/she might not have specific training on specialized equipment or procedures. On the other hand, a person who has training on specialized equipment or procedures can train others even though they lack the broader general knowledge of an electrician or an EE.
No let’s apply this principle to a different scenario. Conglomerated Health Care wants to train its surgeons on a new procedure. Rather than pay a full time surgeon to do the training, they hire me, an engineer, at a lower cost. They send me to a few intensive seminars, give me a snazzy trainer’s certificate and send me out to “qualify” their surgeons on the new procedure. Sounds pretty silly doesn’t it?

IMHO, trainers should be professionals in their field of work with additional, specialized training.
Bob Ragsdale P.E.