NFPA 72, NEC Article 760, IBC/IFC, ADA, local AHJ amendments, UL listings, and manufacturer installation instructions — which code governs what, how they interact, and the mistakes that come from getting that wrong.
Module 1 introduced the code stack at a glance — NFPA 72, IBC/IFC, and NFPA 70 layered on top of each other, with the more restrictive requirement governing where they overlap. This module goes deep on every layer in that stack, plus two that Module 1 didn't cover at all: NEC Article 760's specific wiring-method rules for fire alarm circuits, and the ADA accessibility requirements that shape notification-appliance selection in ways a code-table check alone won't catch.
It also covers the two sources of requirements that can override everything above them — the local AHJ's amendments and discretion, and a manufacturer's own listed installation instructions — and closes with how to actually resolve a conflict when two applicable codes disagree, including the real cases where "most restrictive governs" isn't a clean answer.