code: def add_cable_dist(self, lv_cable_dist):
          
          if lv_cable_dist not in self._cable_distributors and isinstance(lv_cable_dist,
                                                                          LVCableDistributorDing0):
              self._cable_distributors.append(lv_cable_dist)
              self.graph_add_node(lv_cable_dist)
docs: Adds a LV cable_dist to _cable_dists and grid graph if not already existing
          
          Parameters
          ----------
          lv_cable_dist : 
              Description #TODO