NEC Article 200 focuses on the requirements for the use and identification of grounded conductors. This article ensures that grounded conductors are properly identified to maintain system integrity and safety. Here is a detailed overview of NEC Article 200, spanning sections 200.1 to 200.7:

200.1 Scope

This section establishes the scope of Article 200, which covers the identification of grounded conductors in wiring systems. It sets the basic requirements for ensuring that grounded conductors are easily identifiable.

200.2 General

Grounded conductors must be identified in accordance with the requirements outlined in this article. The identification ensures proper installation and maintenance, reducing the risk of electrical hazards.

200.3 Connection to Grounded System

This section requires that grounded conductors be connected to the grounded system in a manner that ensures continuity and safety. It specifies how grounded conductors should be connected to the system grounding conductor.

200.4 Neutral Conductors

The neutral conductor must be identified and used correctly within the electrical system. This section covers the proper identification and use of neutral conductors, ensuring they are distinct from other conductors.

200.5 Identification of Grounded Conductors

Grounded conductors must be identifiable by color or marking. This section outlines the specific requirements for identification:

• 200.5(A) Sizes 6 AWG or Smaller: Conductors size 6 AWG or smaller must be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes on other than green insulation.
• 200.5(B) Sizes Larger than 6 AWG: Conductors larger than 6 AWG must be identified by a continuous white or gray outer finish or by other effective means.

200.6 Means of Identifying Grounded Conductors

Grounded conductors must be distinguishable from ungrounded conductors. The section details the methods for identifying grounded conductors:

• 200.6(A) Sizes 6 AWG or Smaller: Identification by a continuous white or gray outer finish or three continuous white or gray stripes.
• 200.6(B) Sizes Larger than 6 AWG: Identification by a continuous white or gray outer finish or other effective methods such as painting or taping.

200.7 Use of White or Gray Color

The use of white or gray for grounded conductors is specified to ensure consistency and avoid confusion. This section outlines the conditions under which white or gray insulation can be used:

• 200.7(A) General: White or gray insulation is used for grounded conductors.
• 200.7(B) Exceptions: Identified conditions where white or gray insulation can be used for ungrounded conductors if reidentified.

Conclusion

NEC Article 200 provides essential guidelines for the use and identification of grounded conductors, ensuring that they are properly marked and distinguished from ungrounded conductors. These requirements are critical for maintaining safety, preventing electrical hazards, and ensuring proper operation of electrical systems.

For detailed information and further context, referring to the NEC Handbook and other resources provided by the NFPA is highly recommended.