Circuits and conductors: sizing to the NBR 5410 method

In EL1 you learned the rule load ≤ breaker ≤ wire. In EL2 you opened the board and understood the circuit breaker, the RCD (residual current device, DR in Brazil) and the SPD (surge protective device, DPS in Brazil). Now you do the whole calculation. This course teaches you to divide a home into circuits the way NBR 5410 requires, to work out the minimum load of each room, to calculate the design current and to choose the conductor cross-section by three criteria: current-carrying capacity, voltage drop and minimum cross-section. You will see why the same 2.5 mm² wire carries 24 A embedded in masonry and only 16.8 A when it shares the conduit with two other circuits. You will match the breaker to the wire with the rule IB ≤ In ≤ Iz and build the circuit schedule with a one-page design memo. All of it with a single example that runs through the course: a 70 m² house in the interior of São Paulo state, from the survey to the board. There are 8 lessons of 25 minutes, quizzes and a final project with your own home. The course does not qualify you to sign off a design and does not cover industrial three-phase installations.