(a) 
         Heavy-duty diesel-powered equipment includes—
     
    
        
        (1) 
         Equipment that cuts or moves rock or coal;
     
    
        
        (2) 
         Equipment that performs drilling or bolting functions;
     
    
        
        (3) 
         Equipment that moves longwall components;
     
    
        
        (4) 
         Self-propelled diesel fuel transportation units and self-propelled lube units; or
     
    
        
        (5) 
         Machines used to transport portable diesel fuel transportation units or portable lube units.
     
    
        
        (b) 
         Light-duty diesel-powered equipment is any diesel-powered equipment that does not meet the criteria of paragraph (a).
     
    
        
        (c) 
         For the purposes of this subpart, the following equipment is considered attended:
     
    
        
        (1) 
         Any machine or device operated by a miner; or
     
    
        
        (2) 
         Any machine or device that is mounted in the direct line of sight of a job site located within 500 feet of such machine or device, which job site is occupied by a miner.
     
    
        
        (d) 
         Diesel-powered ambulances and fire fighting equipment are a special category of equipment that may be used underground only in accordance with the mine fire fighting and evacuation plan under  § 75.1502.
     
    
        
            Code of Federal Regulations
        
        [61 FR 55527, Oct. 25, 1996; 70 FR 36347, June 23, 2005]