Service Entrance Sizing | Residential Load Calculation NEC Exam Prep
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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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