Just because something works from the outside doesn't mean it's right on the inside, especially when it comes to your home or business's electrical systems.  Electricity is something that we take for granted. If the overhead light turns on and we can read the words of the book we're reading, then everything is fine. Right? Not necessarily.  Improper installation, faulty wiring, code violations, obsolete equipment, and inferior workmanship can cause an electrical shock, damage appliance motors or possibly start a fire.