Trade Foundations

Codebook Navigation

Looking up rules in the model trade codes every licensed installer works under: the NEC (NFPA 70) for electrical, the IPC for plumbing, the IMC for mechanical/HVAC. Covers the chapter/article/section numbering scheme, finding tables like NEC 310.16 ampacity or IPC 709.1 drainage fixture units, box-fill and working-space calculations, and the fundamental rule that local amendments always supersede the model code.