What minimum clearance must be maintained on the trolley wire side between the car and the rib, gob, or timber?

The requirement for maintaining a minimum clearance on the trolley wire side is critical for ensuring safety in mining operations. A clearance of 12 inches provides an adequate distance to prevent contact with surrounding structures such as the rib, gob, or timber. This distance is specifically designed to minimize the risk of electrical hazards, as well as physical interference that could lead to accidents or equipment damage.

Ensuring that there is a proper clearance helps in the safe passage of mining cars, reduces the likelihood of entanglement or collisions, and facilitates maintenance activities. It's vital in maintaining a safe operational environment, particularly in areas where electrical systems and heavy machinery are in use. By adhering to this standard, mine foremen can effectively mitigate risks associated with the movement of mining equipment and maintain a safer work site.