Since 2024, 33 mines have been granted the use of a Powered Air Purifying Respirator (PAPR) through the Petition for Modification process.
Electromagnetic interference can cause failure of a miner-worn Proximity Detection System (PDS) if it is not worn as recommended, such as being worn TOO CLOSE to the battery or motor/blower of a PAPR.
The illustrations show how miners can position these devices when using belt-worn and neck-supported PAPRs and maintain the recommended separation distance.
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Best Practices
To prevent interference, miners must maintain at least six inches of separation between their PDS and the battery or motor/blower of their PAPR.
Source: https://www.msha.gov/news-and-updates/alerts-hazards/filter/papr-pds-positioning-safety-alert