Hierarchy of Controls

Forces, people and injuries — How hard is too hard?

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ISO/TS 15066 body model
This entry is part 5 of 5 in the series Hier­archy of Con­trols

For any­one involved in risk assess­ment and con­trol, there are always ques­tions regard­ing the amount of force it takes to injure a per­son. As soon as we decided that hurt­ing people when they were work­ing or using our products was not OK, clev­er people wanted to know what the lim­its were on forces applied to people. […]

Canada

Instructions for Use – the New ISO 20607

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Instruc­tions are one of the basic items that users expect to get when they pur­chase a product, and yet these import­ant doc­u­ments are often poorly writ­ten, badly trans­lated, and incom­plete. Key product fea­tures are badly described, and inform­a­tion on fea­tures, set­tings and haz­ards may be absent. All of this des­pite the fact that the min­im­um require­ments […]

Complementary Protective Measures

Can Emergency Stop be used as an “on/off” control?

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Emergency Stop Button
This entry is part 16 of 16 in the series Emer­gency Stop

Every couple of months I get an email ask­ing me if there is any reas­on why e-stop func­tions can’t be used as the primary power con­trol (on/off but­ton) for machinery. Fol­low­ing a recent exchange, I thought I would share the reas­ons for why this is such a bad idea. The short answer The short answer is an unequi­voc­al NO. Don’t […]