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.
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Learn to use the printed (or PDF) codebook the way a journeyman actually does: the difference between a model code, an adopted code, and ...