Social & labour
Engineering controls
Physical workplace modifications that isolate workers from hazards — the third tier of the NIOSH hierarchy of controls.
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Engineering controls are control methods that reduce or eliminate exposure to occupational hazards through physical changes to the workplace — such as machine guards, ventilation systems, enclosure, guardrails and barriers — isolating people from the hazard rather than relying on worker behaviour. In the NIOSH hierarchy of controls they rank third, after elimination and substitution and above administrative controls and PPE.
References
hierarchy structure, engineering-control examples, history
five-tier definitions, Prevention through Design
permanence and reliability rationale, lab examples
Overview
What it means
The hierarchy (elimination → substitution → engineering controls → administrative controls → personal protective equipment) ranks strategies by effectiveness because controls closer to the source protect workers independently of compliance behaviour. Engineering controls underpin NIOSH's Prevention through Design initiative, which aims to 'design out' hazards.
How it is used
Used in occupational safety and health management, chemical safety (fume hoods, LEV), machine safety and workplace risk assessment; increasingly referenced in ESG occupational-health metrics.
Why it matters
They are the most reliable widely applicable protection after hazard removal, and anchor the logic of safety-by-design across industries.
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