Pole and Fixture “Effected Projective Area” or “EPA”
For consideration if your plans include the addition of banners, flags, planters, etc. Proper wind load design will provide data to properly choose the correct pole wall thickness. It is only by knowing the EPA value for each object and their respective weight that the proper pole can be calculated and designed accordingly.
- EPA is one of the basic principles for the structural engineering process in outdoor lighting and other mechanical engineering fields.
- EPA is the measurement of a three dimension object on a two dimension area.
- EPA is the projected area combined with the appropriate drag coefficient.
- The drag coefficient can be defined as the resistance created by the object or shape in a fluid environment.