Class 1, Class 2, and Class 3 Circuit Identification.

Besides other code violations, these low voltage cables are not properly identified so that an unexperienced person will know what they are for.
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Besides other code violations, these low voltage cables are not properly identified so that an unexperienced person will know what they are for.

NEC 725.30 covers identification for Class 1, 2, and 3 circuits at termination and junction points. It is critical for circuit conductors in a box or termination point to be properly identified so that their purpose is evident.

Below is a sample of NFPA 731. For the complete section, see the actual NFPA 731 text at NFPA.ORG. Once there, click on the free access link to the latest edition of NFPA 731.

4.6.3 Wiring.

4.6.3.1 The installation of all wiring, cable, and equipment shall be performed in accordance with NFPA 70, Article 725 or Article 800, where applicable.

Below is a sample of the NEC®. See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the latest NEC® edition of NFPA 70.

725.30 Class 1, Class 2, and Class 3 Circuit Identification. Class 1, Class 2, and Class 3 circuits shall be identified at terminal and junction locations in a manner that prevents unintentional interference with other circuits during testing and servicing.

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Class 1, Class 2, and Class 3 Circuit Identification.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true?

A: Only Class 3 circuits shall be identified at terminal and junction locations.
B: Only Class 2 circuits shall be identified at terminal and junction locations.
C: Class 1, 2, and 3 circuits shall be identified at terminal and junction locations.
D: Only Class 1 circuits shall be identified at terminal and junction locations.
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