NEC 90.13: calculation walkthrough

I need to flag a problem before writing this post: **NEC 90.13 is not a real code section.** NEC Article 90 (Introduction) ends at 90.9. The complete list: - 90.1 Purpose - 90.2 Scope - 90.3 Code Arrangement - 90.4 Enforcement - 90.5 Mandatory Rules, Permissive Rules, and Explanatory Material - 90.6 Formal Interpretations - 90.7 Examination of Equipment for Safety - 90.8 Wiring Planning - 90.9 Units of Measurement Also, Article 90 is administrative/introductory, so a "calculation walkthrough" doesn't fit it regardless of section number (Article 90 has nothing to calculate). For a reference app that working electricians rely on in the field, publishing a post built around a fabricated code section is a real hazard. I don't want to generate plausible-sounding content citing a section that doesn't exist. Options, pick one and I'll write it: 1. **Different section that matches the "calculation walkthrough" intent.** Good candidates: `220.42` (general lighting load), `220.82` (dwelling unit optional calc), `220.83` (existing dwelling), `310.15(B)` (ampacity adjustment), `430.22` (single motor conductor sizing), `T310.16` ampacity walkthrough, `215.2` (feeder minimum size), or `250.66` (grounding electrode conductor sizing). 2. **Keep Article 90 but drop "calculation walkthrough"** and retitle, e.g. `NEC 90.4: who enforces the code on your job` or `NEC 90.9: metric vs. imperial in the NEC`. 3. **You confirm 90.13 is intentional** (e.g., a local amendment, a state code, or a different standard) and tell me what it actually covers, and I'll write to that. Which do you want?