Modern tools either are double-insulated or come with a ground pin in a three-pronged plug. Power tools greatly speed up just about any job, but you can’t take them for granted. Tools with frayed cords, cracked casings, or incidents of sparking should be repaired or replaced. This is especially important with heavier-duty tools if they have metal casings. The casings can become energized if there’s a short in the wiring.
Vigilance, as always, pays. Inspect your tools before starting a job. It’s far easier—and safer—to catch and tape a small tear in a drill’s power cord than to chance an injury.
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