Step 1: Understanding the Concept:
This question asks for the year of enactment of the central law to enforce the constitutional abolition of untouchability.
Step 2: Detailed Explanation:
Article 17 of the Indian Constitution abolishes the practice of "Untouchability" and makes its enforcement a punishable offense. To give effect to this constitutional provision, the Parliament of India passed the Untouchability (Offences) Act in 1955.
This Act made the practice of untouchability a cognizable offense. It is important to note that this Act was comprehensively amended in 1976 and was renamed the Protection of Civil Rights Act, 1955. The question specifically asks when the original act was passed.
Step 3: Final Answer:
The Untouchability (Offences) Act was passed in the year 1955.