Building Systems are comparable to ourselves. The skin could be perceived as the siding, the plumbing as the circulatory system, the nerves and brain as the electrical system, all of which are necessary to proper functionality. The following pages give a general oversight of what these systems or portions of a building are within a building, but may not be specific to the system(s) in yours.
Electrical Plumbing HVAC (Heating-A/C)
The system pages are reproduced with permission of ITA