Perhaps you’ve put effort into understanding individual NEC Articles, such as Art. 220 (circuit calculations), Art. 240 (overcurrent protection), and Art. 310 (conductor sizing). But how do you put them together when working an installation during the design phase? And which other Articles might apply to (for example) the power distribution you are installing in a retail occupancy?
Chapter 2 Articles are laid out in a logical sequence, assuming you are working from the service inward. Knowing this helps you apply the Articles in a sequence close to your workflow sequence, if not exactly in synch with it.
But is your workflow correct? To answer that, turn to informative Annex D. There, you will see step-by-step examples, with references and (brief) explanatory text. That retail project you’re working on? It’s covered by Example D3.
One thing you will notice is that the steps always follow the same order. See if you can write these out as you read through some examples. An efficient way to gain proficiency with this process is to use an electrical exam prep product that includes sample problems.
