For each of the following situations, explain the nature of the hazard and describe probable outcomes.
a. A worker brushes his pant leg across a 120-volt terminal strip with screw terminals exposed. Every other screw is hot, with neutral screws intervening.
b. A worker's boot contacts a 440-volt bus bar. A ground path occurs through the worker's foot and the nails in the sole of the boot to the concrete floor. The resistance of the ground path is 10,000 ohms.
c. A worker wires a 220-volt circuit "hot" using a wood-handle screwdriver. The screwdriver slips, and the shaft of the screwdriver makes a direct short across the hot terminal and the adjacent neutral.
d. A worker changes a 120-volt wall receptacle in a garage while standing on a concrete floor. The circuit is energized, but the worker is careful not to touch both the hot wire and the neutral wire at the same time.