Operators should also be aware of less obvious dangers in the workplace that often cannot be completely eliminated:

• Exposed surfaces on the equipment that may be hot or have sharp edges and cannot be practically safeguarded.
  
  
• Ungrounded conductive equipment that may continue to store an electrostatic charge after the equipment has been shut-off.
  
  
• Vapors and materials which may cause allergic reactions or other health problems.
  
  
• Automatic hydraulic, pneumatic or mechanical equipment or parts that may move without warning.
  
  
• Unguarded, moving mechanical assemblies.