Professional Answer: Both the skin effect and the proximity effect cause a non-uniform distribution of current and an increase in effective resistance in AC conductors. However, their causes are different:

• Skin Effect: This is an internal phenomenon where a conductor's own alternating magnetic field induces eddy currents within itself, pushing the main current to the outer "skin" of the conductor.

• Proximity Effect: This is an external phenomenon where the magnetic field from a nearby conductor induces eddy currents, causing the current to redistribute and crowd on one side of the conductor.

The two effects can occur simultaneously and are especially significant in cables with a large diameter or in systems operating at high frequencies. Our product line, particularly our tension stringing equipment and cable tools, is designed with these factors in mind to help our clients achieve optimal electrical performance.