Rough-in rules for bored holes - NEC Article 300

NEC Article 300 covers the general requirements for wiring methods and materials — what Victor calls the "rough-in rules." In this lesson from JCR Productions, we break down the two numbers that quietly govern almost every rough-in decision you'll ever make: the 1¼-inch setback rule and the 1/16-inch hardened nail plate. You'll learn where these requirements actually come from (hint: the NFPA framing and covering manuals), why hardened nail plates exist to defeat a nail gun where PVC plates can't, and how the 30% boring rule really works. We walk through the math live: a 3.5-inch stud × 0.30 = ~1.05 inches, meaning a ¾-inch auger keeps you comfortably inside code — and gives you a factual answer the next time someone claims "a three-quarter is too big." ⚡ Exam Prep Workshops & CE → https://jcrproductions.com/?utm_sourc... 📝 Free Digital Practice Exam → https://quiz.jcrproductions.com/?utm_... In this video: 0:00 — Article 300: general requirements for wiring methods 0:12 — Bored holes, the inch-and-quarter rule, and the nail plate rule 0:53 — Where did this come from? The NFPA framing & covering manuals 1:20 — Coverings and appropriate fasteners (luan, sheetrock, firerock, wood board) 2:01 — Why our nail plates are hardened (and PVC plates aren't) 2:28 — The 30% rule for boring wood members 3:02 — The math: 3.5" stud ÷ 0.30 and the ¾" auger 5:16 — Cables & raceways parallel to framing and furring strips 5:27 — Paragraph E: the roof decking exception (inch and a half) 5:55 — The metal roof comeback and concealed-heat failures 7:38 — Solving the problem: 2x4s laid flat instead of furring strips 8:46 — Paragraph F: shallow grooves, back to an inch and a quarter 9:15 — About JCR Productions training & exam prep This video is a free sample of our paid training. If you're preparing for a licensing exam, continuing education (CE) hours, or just want to sharpen your Code knowledge, head to jcrproductions.com — we'd love to see you in class. 👍 Like this video 🔔 Subscribe for more Code Made Simple breakdowns 💬 Drop your rough-in questions in the comments #NEC #ElectricalTraining #Article300 #Electrician #CodeMadeSimple #WiringMethods #ElectricalExamPrep #JourneymanExam #Roughin #ElectricalCode