Describes any trenchless technology process which requires an operative to enter a pipe, duct or bore. OSHAOccupational Safety and Health Administration has no minimum size limit for Man-Entry; however, they address a much broader concept of “confined space” in Title 29 Code of Federal Regulations Part 1910.146. The minimum size for which this is permissible in the UK is 900 mm (approximately 36 in.).
