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What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?

What is special about a dc circuit ?