Module 8 — Calculations & Final Project
Article 220 • 310 • Voltage Drop • Capstone
Need the actual NEC text?
Open NEC 2023 Free Access Viewer (NFPA.org)
Open NEC 2023 Free Access Viewer (NFPA.org)
Use Article 220 for load calcs, Article 310 for ampacity tables. Confirm your edition/adoption.
Learning Objectives
- Perform basic dwelling and small commercial load calculations (220).
- Apply ampacity tables and correction factors (310) before selecting OCPD.
- Estimate voltage drop and adjust conductor sizing accordingly.
- Complete a mini capstone: layout + compliance check.
Tool — Dwelling Load Estimator (Prompt)
Study tool only. Apply the correct demand factors and rules in Article 220 for your project.
Navigation Tips
- Work through Article 220 in order: general lighting → demand → fixed appliances → HVAC/water heating.
- After VA → Amps (per voltage), go to 310 for conductor ampacity, then pick OCPD in 240.
- If long runs, check voltage drop early to avoid rework.
🔎 Practice Tool: Codebook Navigation
Enter an NEC Article number (e.g., 210) to see what it covers.
Glossary Tool
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