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How to calculate the size of the electrical conductors and the installed circuit breaker to suit the family, good tips or in life, when using electricity, it is always necessary to ensure that electrical safety is first and the power supply is continuous, so it is necessary to must choose electrical conductors and circuit breakers to suit the family, based on experience and practical calculations, I will guide you on the method of choosing the optimal conductor and choosing the appropriate circuit-breaker. In the family so that through this video everyone can do it themselves, install electricity in the family, connect the electricity by themselves, first we need to calculate the total installed capacity in the family is how many kW when converting. 1HP=750W= 9000BTU usually the unit of air conditioner then according to the formula P=UI cos phi if the net becomes 1-phase, then cosphi=1 so we have I=P/U when calculating I current then we deduce CB need to buy and install, and calculate the cross-sectional size of the wire according to the formula S=I/J , j is the allowable current density, usually j=4-6 A/mm2 copper wire, aluminum wire is j =2-4.5A/mm2 according to this formula We will calculate the size of good and electrically safe conductors.
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