In an answer on englishforums.com it says that each are exactly the same. But I wonder if which is really the case. Electrician ran neutral and ground to the same bar, and is particularly telling me It is common exercise. Images clearly show my principal and sub. Is he correct? https://reidhjdws.blogolize.com/getting-my-full-service-web-design-agency-in-miami-to-work-75554184