I'm not getting into an argument on this issue, because their is good and bad in most areas on the design side of things.. But generally speaking an electrician would not be capable on designing the complete electrical installations for a large commercial or industrial project, and would never be asked too either.
Having been in and experience of working in a design office, i can't tell you how often it is, that the Engineers are working initially without the full details, so will generally often submit a concept drawing as a 1st issue. The Resident Electrical Engineer, or manager will then conduct a design review, marking/clouding the drawings up, complete with comments and return to the designer. REV 1 will then become the first ''working/installation'' drawing... But due to continuous changes, the final ''As Builts'' could be up to REV 6, 7, 8!! i've known one drawing to have 19 revisions!! ...lol!!!
Design review is initially my biggest element of work on all my projects, and were talking about literary 100's if not thousands of drawings covering everything from basic final circuit layouts, ELV systems, mechanical plant and controls, to external/internal MV and LV main distribution...
