Branch circuits ecodesign

The modeling of an industrial, commercial or residential electric power systems, pursuing goals on safety, energy and costs saving, operational performances, needs innovations and new approaches to be effective. In the aim of underlining parameters as guideline and indices of rules of thumb the paper approaches their definitions as much as possible in an easy manner for a suitable use by heart. Operational parameters like cable steady current S-density and transient current T-density, load current moment μ-density are introduced to support in a new way the selection and sizing of the cross sectional area S of circuit conductors and the understanding of their behavior. The introduced load current moments and joule moments are specific parameters that can assist the system design to guarantee energy saving, reduced voltage-drops and losses, a higher value of current densities, reduced volume of conductors and other related goals of efficiencies. The ecodesign needs a cultural change of classic approaches.