You're at the panel. #14 copper, 75ยฐC terminations. What's the biggest breaker you can legally land on it? On the truck, you'd grab a 15 without thinking. Under the clock on exam day, with Table 2 sitting in front of you, a lot of solid electricians answer 20 โ and lose the mark. Here's why it gets you: The table says 20. Table 2, #14 copper, 75ยฐC column โ ampacity is 20A. That's a real number. If you stop there, you're wrong. The rule says 15. Rule 14-104(2) is the small-conductor rule, and it overrides the table for #14, #12, and #10. No exceptions on a standard branch circuit: - #14 Cu โ 15A max - #12 Cu โ 20A max - #10 Cu โ 30A max - #12 Al โ 15A max - #10 Al โ 25A max Table 2 even flags this for you โ there's a ยง footnote on those three rows that says "See Rule 14-104(2)." The code is pointing you off the table. Miss that footnote, you fail the question with more information, not less. The part that catches the people who know code well: Table 13 lets you round up to the next standard breaker size โ and the "16-20A" band says 20A is fine. So now two tables in the book are both whispering "20." The opening line of 14-104(2) โ "Except as provided for by Subrule 1)(c)" โ is the tie-breaker. That exception is for motors, transformers, heaters, single-luminaire runs under 30-412. A general branch circuit isn't one of them. The hard cap wins. 15A. The 30-second method, every time you see an ampacity question: 1. Cu or Al, and which termination column (4-006) 2. Base ampacity off Table 2/4 3. #14, #12, #10? Stop. Go to 14-104(2) first. That cap governs, not the table. 4. Derating if bundled/hot ambient โ Table 5A/5C off the 90ยฐC column, then check against termination rating, take the lowest 5. Breaker size: small conductor = the hard cap. Bigger conductor with no exact match = Table 13 next-size-up This isn't a knowledge gap. You know this in the field with your eyes closed. It's a paper-navigation gap โ and that's the entire difference between "good electrician" and "Red Seal electrician" on exam day.