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Explain EPA (EFFECTIVE PROJECTED AREA) of a pole.

Effective Projected Area (EPA) is the exposed surface area of a fixture or bracket multiplied by a shape factor which varies depending on the shape of the fixture or bracket. For example, a large shoebox fixture will present more resistance to the wind than will a round or cylindrical shape.

 

The shorter the pole, the greater the EPA as the pole will have a greater overturn moment (major form of stress at the base of the pole). The taller the pole, the less the surface area and wind force that the pole will be able to cover.

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