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Fusing Current Formula:
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The fusing current formula calculates the current at which an aluminum wire will melt or "fuse" based on its diameter. The formula is specifically designed for aluminum wires with a constant value of 7585.
The calculator uses the fusing current formula:
Where:
Explanation: The formula shows that fusing current increases with the 1.5 power of the wire diameter, meaning thicker wires can carry significantly more current before fusing.
Details: Accurate fusing current calculation is crucial for electrical safety, circuit protection design, and preventing electrical fires by ensuring proper fuse and wire sizing.
Tips: Enter the wire diameter in inches. The value must be greater than zero. The calculator will automatically compute the fusing current using the aluminum constant of 7585.
Q1: Why is the constant 7585 specific to aluminum?
A: Different materials have different electrical and thermal properties. The constant 7585 is derived from aluminum's specific resistivity and melting point characteristics.
Q2: Can this formula be used for other wire materials?
A: No, this formula with k=7585 is specific to aluminum. Other materials like copper have different constant values.
Q3: What factors affect fusing current in real applications?
A: Besides diameter, factors include ambient temperature, insulation type, installation method, and duration of current flow.
Q4: How accurate is this formula for practical applications?
A: While providing a good estimate, actual fusing current may vary based on specific alloy composition and environmental conditions.
Q5: Is there a minimum diameter for which this formula applies?
A: The formula works for standard wire diameters, but extremely small diameters may have different behaviors due to surface effects.