code: def add_lv_load_area(self, lv_load_area):
          # TODO: check docstring
          
          self._lv_load_areas.append(lv_load_area)
          if not isinstance(lv_load_area, MVCableDistributorDing0):
              self.peak_load += lv_load_area.peak_load
docs: Adds a LV load_area to _lv_load_areas if not already existing
          
          Args
          ----
          lv_load_area: :shapely:`Shapely Polygon object<polygons>`
              Descr