Calculadora de Bitola de Fio

The Wire Gauge Calculator helps determine the minimum cross-sectional area of the electrical conductor (wire gauge) for a circuit, based on the electric current calculated from power and voltage. It uses the formula I = P / V, where I is current in amps, P is power in watts, and V is voltage in volts. Then it consults a simplified table based on the NBR 5410 standard, which defines standard gauges (1.5 mm², 2.5 mm², 4 mm², 6 mm², 10 mm², 16 mm², 25 mm²) and their maximum current capacities for low-voltage residential and commercial installations.

When to use: ideal for sizing wires in residential electrical projects, such as lighting circuits, outlets, showers, electric water heaters, and air conditioners. Also useful to check if an existing cable supports the current of a new appliance. The tool simplifies the process by eliminating the need to consult complex tables and automatically calculating the current from the entered data.

Precautions: the calculator provides a result based on a simplified table, but does not replace a complete electrical design by a qualified engineer or technician. Consider factors such as cable length (voltage drop), ambient temperature, circuit grouping, and installation type (embedded or exposed). Always use appropriate circuit breakers and protection devices. For inductive loads (motors), the starting current may be higher than the nominal current.