Section 15

Every dangerous part of any machinery shall be securely fenced unless it is in such a position or of such construction as to be as safe to every person employed or working on or entering into the premises as it would be if securely fenced:

Provided that so far as the safety of a dangerous part of any machinery cannot by reason of the nature of the operation be secured by means of a fixed guard the requirements of this section shall be deemed to have been complied with if a device is provided which automatically prevents the operator from coming or being brought into contact with that part.