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This document presents a comprehensive analysis and design overview of electrical circuits adhering to the NF C 15-100 standards, focusing on Circuit1 and Circuit2 configurations. The objective is to provide detailed specifications and operational parameters for electrical circuits, ensuring safety and efficiency. Utilizing a systematic approach, the document outlines the characteristics of power supply, including three-phase and four-phase configurations, voltage levels, neutral regime specifications, as well as the associated current ratings and power factors. Key methodologies included in this analysis encompass a thorough identification of device specifications such as circuit breakers and thermal and magnetic current ratings. Results indicate the maximum fault current handling capabilities and effective thermal management strategies, with a clear delineation of electrical wiring parameters, including cable types, lengths, cross-sectional areas, and allowable resistances. The findings demonstrate compliance with safety protocols and stabilization of electrical circuits under varying operational conditions. Overall, this document serves as a vital resource for engineers and technicians involved in electrical system design and implementation.