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The YouTube video titled "Clase 2 bt" focuses on the applications, regulations, and practical uses of low voltage cables. The video explains the importance of selecting the right cable based on factors such as the location of the installation, whether it is a photovoltaic installation, a residential building, or a commercial center. The video also highlights the importance of using cables that meet fire safety standards, such as Afumex Class cables, especially in buildings where fire safety is crucial. The video discusses different types of cables, including flexible cables and those with PVC insulation, based on their fire safety properties. It also highlights the importance of installing cables that meet regulatory requirements for specific applications, such as motor power supply with frequency converters. The video discusses the issue of harmonics in interconnections and how they can elevate the frequency, causing the skin effect to occur. The video emphasizes the importance of using the right cable to avoid impedance matching and prevent the loss of desired currents and erosion on the motor's working surface. Additionally, the video explains the general method for calculating the cable's section based on the applicable regulations and the specific requirements of the installation.