There are many types of wire connectors out there but these are some of the most common ones you'll encounter.
The NEC Chapter Three wiring methods include various cable types, such as: 1) armored cable (Type AC) [Art. 320]; 2) metal-clad cable (Type MC) [Art. 330]; 3) nonmetallic-sheathed cable (Types NM and ...
Underlined text indicates a 2017 Code change. A. Type MC cable must be listed. The fittings must be listed and identified for the use. [330.6] Type MC cable is made with several types of metal sheaths ...