Raju: On the social aspect of excommunication, one is inclined to think that the position of an excommunicated person becomes that of an untouchable in his community, and if that is so, the Act in declaring such practices to be void has only carried out the strict injunction of Article 17 of the Constitution, by which untouchability has been abolished and its practice in any form forbidden.

this is just on facet and its not based on article 17