def add_lv_load_area_group(self, lv_load_area_group):
        """Adds a LV load_area to _lv_load_areas if not already existing.
        """
        if lv_load_area_group not in self.lv_load_area_groups():
            self._lv_load_area_groups.append(lv_load_area_group)
Adds a LV load_area to _lv_load_areas if not already existing.