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How to Calculate Wire Current Capacity

    • 1). Refer to the wire or cable specification sheet and find the cross-sectional area of the wire conductors. The cross-sectional area will be expressed in square centimeters, or cm^2.

    • 2). Refer to the wire or cable specification sheet and find the current density. Current density will be expressed in amperes per square centimeter, or A/cm^2.

    • 3). Calculate the wire current capacity using the following formula: current capacity = (cross-sectional area) x (current density). For example, if you have a wire with a cross-sectional area of 0.2 cm^2 and a current density of 400 A/cm^2, the current capacity is 80 amperes, or 80A: (0.2) x (400).

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