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Purpose of PPE and Lifesaving Equipment

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Why is PPE described as the "last line of defense" in the workplace?

PPE sits at the bottom of the Hierarchy of Hazard Controls — used when all other measures are insufficient.
PPE sits at the bottom of the Hierarchy of Hazard Controls — used when all other measures are insufficient.
Workers must be trained not only in how to use PPE, but also when it's required and how to maintain it properly.
PPE is the last line of defense — it should never replace engineering or administrative hazard controls.
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