Quick Hits

⚡ Quick Hit — Episode 1

Chapter 2 Intro + Article 200: Grounded Conductors

Welcome to NEC Chapter 2 — Wiring and Protection.

Chapter 2 covers many of the physical rules electricians use when installing and protecting electrical conductors, including branch circuits, feeders, services, overcurrent protection, grounding, and bonding.

The chapter runs from Article 200 through Article 270, with separate articles near the end covering systems over 1000 volts AC / 1500 volts DC.

📘 Article 200 — Use and Identification of Grounded Conductors

Article 200 establishes requirements for the use and identification of grounded conductors, including conductor identification, terminal markings, and grounded conductors used in premises wiring.

A key point: grounded conductor does not always mean neutral conductor. A grounded conductor is connected to a grounded system point, while a neutral conductor is associated with a system's neutral point. Certain systems can have a grounded conductor without having a neutral point.

For identification, white or gray is the familiar color association for grounded conductors.

🔌 200.4 — General Requirements

200.4(A) addresses insulation of grounded conductors. For systems 1000 volts or less, an insulated grounded conductor generally needs an insulation rating corresponding to the ungrounded conductors on that circuit.

200.4(B) addresses continuity. The continuity of a grounded conductor cannot depend on a metal enclosure, raceway, or cable armor. The grounded conductor needs its own continuous conductor path.

This is especially important on multiwire branch circuits.

🧠 Quick Check

True or False: On a multiwire branch circuit, the continuity of the grounded conductor is allowed to depend on the metal enclosure through which it passes.

Answer: False.

Per 200.4(B), grounded-conductor continuity cannot depend on a metal enclosure, raceway, or cable armor.

⚡ Takeaway

Article 200 starts with two fundamentals:

• Know what a grounded conductor is.

• Know how that conductor must be identified and maintained throughout the circuit.

Next: Article 200.5, 200.6, and grounded-conductor identification.

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