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The new CSA Z432 machine guarding Standard is out and has some interesting improvements. It is only 8 pages longer than the previous version but actually provides more useful information and quantifiable targets. It took effect on October 2016.

The following text is reproduced from http://shop.csa.ca:

Overview
Moving machine parts have the potential to cause severe injuries in the workplace and a significant percentage of injuries in the workplace can be attributed to machine-related incidents each year. Machine safeguarding measures are essential to protecting the workers who come into contact with machines as part of their job duties. Any machine that may cause injury must be safeguarded.
The third edition of CSA Z432- Safeguarding of Machinery specifies requirements for the design, manufacture (including remanufacture and rebuilding), installation, maintenance, operation, and safeguarding of industrial equipment to prevent injuries and accidents and enhance the safety of personnel who operate, assemble, and maintain machinery. The need for a new edition was prompted by the changing technology related to these machines and the wish of stakeholders, including regulators, employers, manufacturers, and labour, for a document that would reflect the latest thinking concerning operator and equipment safety.

CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of federal, provincial, and territorial occupational health and safety government agencies.

Highlights of Z432

• Expanded Scope to incorporate new international Standards on machinery design and performance and to provide additional information for the identification of hazards, including non-mechanical
• Contains the methodology for performing a comprehensive risk assessment
• Applies to newly manufactured, rebuilt, and redeployed machinery but may also be used to set upgrade targets for existing machinery
• Provides advice on the basic principles of safeguarding and safety control performance

Numerous Standards deal with this issue for the specific types of machines they cover. No attempt will be made here to discuss these in depth and the reader is encouraged to review standards such as CSA Z434 (the robotics Code), CSA Z142 (the punch press Code), ANSI B11.23 (CNC machine Code) and so on.
The general 'Safeguarding of Machinery' Standard, CSA Z432-04, addresses the need for a control to allow for "setting, teaching, process changeover, fault-finding, cleaning, or maintenance". CSA Z432-04 calls for the use of an enabling device with a 3-position switch, such as the one shown in the photo to the left.
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