Design Case Study. In an actual case history of an electrocution fatality, Figure 17.18(a)illustrates the way the chuck key for a hand-held electric drill was conveniently attached to the power cord so that it would always be readily available for operator use in changing bits. The fatality occurred when the twisted wire wore through the cord insulation after continued use. Figure 17.18(b)illustrates a much safer way to connect the chuck key. What other factors probably contributed to this fatality and how could it have been prevented? Suppose that the ground pin had been broken off the plug for this drill. How would this code violation have affected this fatality?