Use the correctly sized spanner ( preferably a ring , box or socket spanner ) for nuts and bolts
3.
Personnel protective equipment , protective devices and apparatus for work on energized systems up to 1000 v ; socket spanner vde specification
4.
Insert special bolt into the preset hole of c form parts , where the bolt will be fixed into the threaded hole of wedge , then screw the bolt on with a socket spanner until the first nut drops