# 1 Master Electrician Exam Prep 2023 | NEC 220.86 Optional Method Tutorial Welcome to our in-depth tutorial on how to perform service and load calculations for a school using the optional method as outlined in the 2023 National Electrical Code (NEC), Section 220.86. This video is an essential resource for anyone preparing for their electrical exams, including those aiming to become a master electrician. 📚 What You Will Learn: Detailed steps on how to calculate service and load using NEC 220.86
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⚡ NEC Calculation Tip Most Electricians Miss When you’re doing load calculations, the NEC is clear: ✔️ Use nominal voltage — not measured voltage ✔️ Round final amps per 220.5 👉 .5 and up = round up 👉 less than .5 = round down Example: 246 V ≠ 246 V in calculations It becomes 240 V 19.5 A → 20 A 19.4 A → 19 A These rules apply to: • Branch circuits • Feeders • Services • Demand loads If you don’t apply rounding correctly, your sizing can be wrong. 📌 Save this for your NEC math fundamentals ⚡
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