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The National Electrical Code (NEC) primarily focuses on ensuring the safe installation of electrical wiring and equipment in the United States. It encompasses various components aimed at protecting both workers and the public from electrical hazards.

Installation guidelines for appliances, safety standards for electrical materials, and rules for residential electrical installations are all crucial aspects of the NEC. These guidelines help ensure that electrical systems operate safely and efficiently, addressing potential risks and setting clear criteria for compliance.

Telecommunication systems, while they may involve electrical components, are typically governed by different codes and standards that focus specifically on communication systems, rather than the general electrical safety that the NEC encompasses. Thus, regulatory compliance concerning telecommunication systems falls outside the scope of the NEC, making it the correct choice for what does not belong as a component of this code.