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</center><p>Part IV, Listing requirements (for manufacturers). The application of the article is appropriate for many instrumentation applications. Part III, Classand Classcircuits. The title of Artincludes that phrase, so the title is a mouthful. To  NEC Article requirement or loophole Abstract: It is argued that Article is one of the less obvious but powerful sections of the National Electrical Code. This article covers Circuits and equipment shall comply with the articles or sections listed in (A) through (N). However, a more succinct title would leave much room for misinterpretation However, the constraints imposed by the NEC are very stringent Listedpair communications cables are permitted to substitute for Classand Classcables installed in accordance with Section and with the cable substitution requirements Section (A). In theNEC, Section has two alternate provisions for assuring that the cables carrying power and signaling do not Article of the National Electrical Code (NEC) provides the requirements for “Class 1, Class 2, and Classremote-control, signaling, and power-limited circuits.”. Class 1, Class 2, and ClassCircuit Requirements. Number and Size of Conductors in n Spread of Fire or Products of Combustion The title of Article is "Class 1, Class 2, and ClassRemote-Control, Signaling, and Power-Limited Circuits." Section says Article covers such circuits where they "are not an integral part of a device or appliance." Certainly the description "remote-control, signaling, and power-limited" covers most instrumentation and control The invocation of Article permitted the use of cable with small wire size and much lower cost. Part II, Classcircuits. A remote-control, signaling, or power-limited circuit shall comply with the following parts of this article: ClassCircuits An explanation of the different groupings and classification of circuits referenced in Article is necessary to understand the impact of attempting to apply this article to industrial  The classification of instrumentation circuits and other remote control, signaling, and power limited circuits is a common source of problems for users of the NEC. This Article will  Article consists of four parts: Part I, General information. It will permit the use of less expensive equipment and wiring methods. Only those sections of Article referenced in this article shall apply to Class 1, Class 2, and Classcircuits.</p></translate>
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