According to regulations, how tight should roof bolts be installed?

The correct answer reflects the regulations set forth by the Roof Control Plan (RCP), which provides specific torque specifications for installing roof bolts in mining operations. The specified range of 125-175 ft-lbs torque ensures that the bolts are secured adequately to support the roof effectively, thereby contributing to the safety and stability of the underground structure. This torque range is established based on extensive research and testing, which has shown that it provides optimal holding strength while minimizing the risk of bolt failure and maintaining structural integrity.

Using the manufacturer's specifications, while crucial, may not align with the higher standards set by the RCP, which is specifically designed to address the unique conditions and challenges encountered in mining environments. Simply tightening the bolts as much as possible without breaking them can lead to over-torquing and bolt failure, compromising safety. Similarly, employing minimal tension could result in insufficient support, which is contrary to the goals of safety and stability in mine operations. Thus, adhering to the RCP's recommendations is vital for ensuring both compliance and the safety of personnel working in these environments.