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the term isolated refers to a certain section or even a whole circuit that is separated or de- energized from a power source. high voltage lines are often "isolated" by opening swiches or removing jumpers, usually when a section of line is isolated it is because of trouble, problems or dead work. if a circuit is loop fed rather then radial fed, you can isolate a section of damaged line and still keep many if not all customers hot. But don't be confused if a section of line is isolated that does not mean its dead because IF ITS NOT GROUNDED ITS NOT DEAD!

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