📘 NEC Chapter 2 Breakdown: Wiring & Protection Essentials

🔹 Article 200 – Grounded Conductor ID

• Neutrals (#6 and smaller): Must be white, gray, or striped.

• Larger than #6? You can tape or mark it at terminations.

• 💡 Why it matters: Prevents misidentifying a neutral as a hot.

🔹 Article 210 – Branch Circuits

• Covers receptacle spacing, GFCI/AFCI locations, and circuit sizing.

• 💡 On site: Know your kitchen, bathroom, and exterior outlet rules cold.

🔹 Article 215 – Feeders

• Feeders go from the main panel to subpanels.

• Watch for ampacity, length derates, and disconnects.

🔹 Article 220 – Load Calcs

• How to calculate service, feeder, and branch loads.

• Required for panel sizing and avoiding overloading.

🔹 Article 225 – Outside Feeders

• For feeders run outside but not part of the service.

• Think conduits on rooftops, or shed panels.

🔹 Article 230 – Services

• Where utility power enters the building.

• Service entrance conductors, main disconnects, clearances.

🔹 Article 240 – Overcurrent Protection

• Covers breaker and fuse sizing.

• Key for tap rules, conductor protection, and short-circuit safety.

🔹 Article 250 – Grounding & Bonding

• Probably the most cited article in the field.

• Think: ground rods, equipment bonding, water pipe grounding, isolated grounds.

✅ Why It Matters to You

If it’s wired, it better be protected.
If it’s metal, it better be grounded.
Chapter 2 makes sure both happen.

❓ Quick Code Check

Choose the correct answer:

Answer below 👇

✅ Answer: B) Voltage drop & conductor size

📘 Reference:
NEC 215.2(A)(1) & 220.61 – These sections address feeder conductor sizing and load calculations, which are essential when installing sub-panels, especially at long distances where voltage drop becomes a key concern.