A worker was electrocuted when he drilled through a wall and the drill bit contacted an electrical wire inside the wall by cutting through its insulation. The ground pin of the electric plug for the drill was broken off.

A worker was electrocuted when he drilled through a wall and the drill bit contacted an electrical wire inside the wall by cutting through its insulation. The ground pin of the electric plug for the drill was broken off. Describe several ways this fatality could have been prevented. 250 word minimum, references and accompanying citations.