When the bus upright mounting, through bolts should be left to right, from the inside to wear out, the appropriate length of the connecting bolt is exposed fastener nut 2-3.
When the bus stand-up installation, the running bolt should be left-to-right, from the inside out, the connection bolt length should reveal the nut 2 to 3 buckle.
When the busbar is installed vertically, the through bolt shall be penetrated from left to right, from inside to outside, and the length of the connecting bolt shall be 2-3 buttons above the nut.