WASHINGTON, July 15 (TNSFR) -- M-Class Mining LLC, Macedonia, Illinois, has petitioned the U.S. Department of Labor Mine Safety and Health Administration to modify an existing mandatory safety standard for electric equipment and conductors. The company wants to allow the use of intrinsically safe Powered Air Purifying Respirators within 150 feet of pillar workings or longwall faces at its MC#1 Mine in Franklin County.

The petition specifically addresses a regulation that governs the . . .

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