When a technician reported for work shortly before 7 a.m., he picked up exactly where he’d left off the previous day — continuing the task of testing a water-cooled power supply at the unit’s manufacturing facility. An employee of the company that made high-voltage power supplies, he had left the test setup intact with power off overnight. On this particular morning, he resumed his regular testing activities, but it wasn’t long before this seemingly routine job would ...

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