What section must metallic raceways and associated conductors operating over 1,000 volts be arranged in accordance with to avoid heating?

The correct answer focuses on the need for proper arrangement and installation practices for metallic raceways and conductors operating over 1,000 volts to minimize the risk of overheating. Sections 300.20 and 300.35 of the National Electrical Code (NEC) specifically address the requirements and considerations for conductors and raceways carrying high voltage.

Section 300.20 details the necessary separation and arrangement of conductors operating at different voltages to prevent mutual heating that can arise from induced currents. This is critical for ensuring safe operation and maintaining the integrity of electrical systems.

Section 300.35 emphasizes the detailing of raceways, including their proper support and installation. By following these code sections, it is ensured that heat buildup is minimized, thus improving safety and functionality.

The selection of A as the answer reflects an understanding of the importance of these particular sections in effectively controlling heating in high-voltage electrical installations, reinforcing best practices in electrical safety.