So what are the differences between commercial and residential?

There are different accessibility, wiring, and power phase needs in commercial vs. residential.


  With commercial buildings typically being harder on their electrical systems it means that their systems need to be more accessible to perform repairs more often.  Also with the systems being more accessible they will require a higher grade of protection.  Using higher grade wiring is a necessity.  There are also different power phases categorized by utility companies' electrical loads.