ICAO (a United Nations Agency) Annex 6 to the Convention on International Civil Aviation, Part 1 states in paragraph 4.4.1.2:

"An instrument approach shall not be continued below 300 m (1 000 ft) above the aerodrome elevation or into the final approach segment unless the reported visibility or controlling RVR* is at or above the aerodrome operating minima."

Refer to the country's specifics of operations Aeronautical Information Publication for differences in Approach Bans.