Article 300 is one of four Articles that form the basis for applying Chapter 3 wiring methods (the other three are Art. 310, Art. 312, and Art. 314). The requirements of Art. 300 apply to all Chapter ...
Your garage wiring probably worked fine when it only had to feed a door opener and a single outlet. The trouble starts when ...
Article 215 covers the installation, conductor sizing, and overcurrent protection requirements for feeder conductors. The requirements for feeders have some similarities to those for branch circuits.