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Working deep inside a crowded 480V control panel, a veteran electrician named Mark accidentally slipped, his insulated screwdriver brushing a live busbar. There was no arc, no flash, just the silent, momentary realization that the tool's thick, certified insulation was the only thing standing between him and a fatal shock. He pulled back, heart pounding, the incident a stark, terrifying reminder of the non-negotiable role of his equipment. For any professional or serious DIY enthusiast working n …