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Lesson 8: “Control Trace Temperatures” covers the relationship between trace currents and temperatures. Traces must be sized carefully to carry their currents with acceptable temperature rise, and Doug covers why this is so, and then how to go about doing this. In the case where a catastrophic failure might severely overload a trace, Lesson 8.2 covers how to size a trace to last long enough to safely “shut down” the system after such a failure.