Electrical Wire & Cable Size Formula

Electrical wire or cable in transformers are referred to as conductors. Determining the sizing of the conductor is an important factor as it carries the electrical current. Wire gauge is used to determine the size of the wire or cable. This determines the amount of electric current a wire can safely carry, as well as its electrical resistance and weight. Given here is the electrical wire & cable size formula for calculating the size of the conductor or electrical wire of a transformer.

Conductor Size Formula


δ = I / A


δ = Conductor Size
I= Current
A = Current density

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Electrical wire & cable size formula is derived as δ = I / A where I = Current and A = Current Density. Just by dividing the current with current density gives you the result of conductor size.

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