def add_cable_dist(self, lv_cable_dist):
        """Adds a LV cable_dist to _cable_dists and grid graph if not already existing
        
        Parameters
        ----------
        lv_cable_dist : 
            Description #TODO
        """
        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)