What you don’t know can hurt you
Be certain systems are safely grounded
An engineer at a large chemical plant in the Eastern US
inspected plant substations that were grounded via a high
resistance grounded system. He discovered that two of 10
substations had been operating with failed systems and nobody
knew it. When the connection to ground is interrupted, usually
because of a mechanical failure in the resistor, there is
usually no sign that the ground has been lost. Without
resistance grounding, transient overvoltages can occur on the
system, which can endanger personnel and cause insulation
failures on motors throughout the system. Whats more,
without grounding, current-sensing ground-fault protection will
not indicate the presence of a ground fault that could damage
equipment and injure workers.
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