Can the AHJ override the NEC, and how do I find mine?

Yes — the AHJ has the authority to interpret the NEC, grant or deny variances, and adopt local amendments that are stricter (and occasionally more lenient) than the base code, so their ruling governs your project. Find yours by contacting the building or electrical permit office for the city or county where the work is located; the code edition they enforce and any local amendments define what you must meet.