This Standard applies to the protection of persons from the hazards arising from the use of mobile or stationary machinery. It provides the criteria to be observed and the description, selection, and application of guards and safety devices. This Standard is intended for those who design, build, modify, install, use, operate, or maintain machinery, machinery guarding, or safety devices. It is also intended to be used by those concerned with information, instruction, and training in safe working practices.

Lien : http://ohs.csa.ca/standards/equipment_machinery/Machine_Safety/Z432-04.asp