Why are utility and electrician tables different? | NEC Article 310

In this video, Victor Ring breaks down why there are two sets of ampacity tables in your codebook — yours at 30°C and the utility's at 40°C — the Code Made Simple way, so you understand it, not just memorize it. Whether you're prepping for your licensing exam or just want to stop sizing conductors off the wrong table, you'll walk away knowing exactly which tables are yours, why 86°F is electricity's happy place, and how to spot a utility table on sight. ━━━━━━━━━━━━━━━ ⚡ READY TO PASS YOUR EXAM OR GET YOUR CE HOURS? We've trained 20,000+ electricians since 1985 — 93% first-time pass rate. Pick the format that fits how you learn: ⚡ Exam Prep Workshops & CE → https://jcrproductions.com/?utm_sourc... 📝 Free Digital Practice Exam → https://quiz.jcrproductions.com/?utm_... 🏢 Private On-Site Training for Teams, Unions & Companies → jcrproductions.com/pages/contact ━━━━━━━━━━━━━━━ ⏱️ CHAPTERS 0:00 Two sets of tables: yours vs. the utility's 0:29 Why YOUR tables are 30°C (310.15(B)(1)) 0:53 Reading the 60°C / 75°C / 90°C insulation columns 1:45 The 86°F "happy place": 100% efficiency 2:08 How fast heat costs you efficiency 3:40 The three grades of equipment (30°C / 40°C / 50°C) 5:03 Why the 50°C grade is only 75% efficient 5:24 The one place it still works: residential load centers 5:47 How you ended up with the utility tables 6:28 310.16 vs. 310.18: whose tables are whose 7:19 Aluminum, Z-rated & reading right-to-left 8:19 Where to learn more ━━━━━━━━━━━━━━━ ABOUT JCR PRODUCTIONS North Carolina's #1 electrical education since 1985. We help electricians pass their licensing exams and stay current with CE — taught by Victor Ring with our proven "Code Made Simple" method. Understand the Code. Pass the first time. Come back for the CE electricians actually look forward to. 1451 Mt Ulla Hwy #101, Mooresville, NC 28125 · 📞 704.696.8555 · ✉️ info@jcrproductions.com 📸 Instagram: @jcrcode · 👍 Facebook: /codemadesimple #Electrician #NECExam #ElectricalExamPrep #CodeMadeSimple #ElectricalLicense #Electrical #Ampacity #ContinuingEducation #Sparky #Trades