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Household Electricity

Calculation of current in three-phase, formula and protection for the

carlosgiorgetti

hace 6 años

Good morning, what is the formula to calculate the three-phase current of an air of 1000W of power (three-phase). I = Power / 1.73 * 380 * cos pi ?? And in Argentina the tension is taken as 220v in mono and 380v in three phase? If so, which driver would we choose according to the AEA tables? And what is the current of the PIA that protects the cable? It is an exam question that a friend thinks he responded poorly a few days ago. I get the impression that in three-phase the driver handles less work current, my friend chose a 4mm driver and a 20A PIA ... Eye that is an exam question over there in practice is used but here we have to Justify everything with tables and formulas. Thank you!!

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nastor

17.232

hace 6 años

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hace 6 años

Hi Carlos The formula for three-phase alternating circuits is fine, and assuming that 1000 w is of electrical power (since it is an exam we can take it like this), the current would be around values less than 2 amps per conductor [consideringcosineoffi0.8] if we go to a table it will give us conductors of less than 0.5 mm² in section (in this case the double thermomagnetic protection is 2 x 5 A curve C, or less). Now, if we consider that in home installations the cables to be used should not be less than 1.5 mm² (in this case the double thermomagnetic protection is 2 x 10A curve C, or less) If we are more specific, the minimum regulatory section (AEA 2006) for wiring of special use circuits must be 2.5 mm² conductors, ( in this case the double thermomagnetic protection is 2 x 15 A curved C, or less) As you can see, the example for the exam is devoid of reality, anyway the answer is what I gave. Your friend was ugly. Regards

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