There are many installations an electrician must deal with that involve applicable codes other than the electrical code [building, mechanical, plumbing (Yes), and energy codes are just a few].
Are you suggesting an electrician with a real world problem cannot come here and get help if the answer cannot be found in the electric code?
[BTW - the mechanical and electrical codes conflict with each other with respect to disconnects for rooftop equipment....an electrician can install a disco 100% compliant with the electrical code and still fail his inspection because the mechanical code is more restrictive...shouldn't this electrician be able to get help here?].