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MSHA Mining Heat Stress Overlay — Heat Stress Control Measures

Mining heat stress overlay with hot-work-site trigger and mining-specific controls.

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Governing metric
WBGT
Authority
Mine Safety and Health Administration
Jurisdiction
Usa Mining
Legal status
Guidance
Published
2001 (unverified)
Rule type
Control Overlay
Standard ID
HGC-049

Check a reading against this rule

The drag-to-check calculator needs JavaScript. Every value it can show is a row of the table below, which is computed by the same engine.

Governing formula

No standalone formula is published for this standard; see programmable logic and parameters below.

Control measures

Acclimatized workers

WBGT (°C)Light
180 W
Moderate
300 W
Heavy
415 W
Very heavy
520 W
24Not triggeredNot triggeredNot triggeredNot triggered
25Not triggeredNot triggeredNot triggeredNot triggered
26Not triggeredNot triggeredNot triggeredNot triggered
27Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
28Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
29Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
30Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
31Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
32Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
33Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
34Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
35Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
36Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)

Unacclimatized workers

WBGT (°C)Light
180 W
Moderate
300 W
Heavy
415 W
Very heavy
520 W
24Not triggeredNot triggeredNot triggeredNot triggered
25Not triggeredNot triggeredNot triggeredNot triggered
26Not triggeredNot triggeredNot triggeredNot triggered
27Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
28Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
29Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
30Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
31Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
32Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
33Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
34Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
35Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)
36Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)Hot work site (≥26°C)

Inputs

Required inputs: wbgtC

Optional inputs: acclimatization

Sources

Update history