Oil filled sectionalizers marked F-3 can be opened under load.

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Multiple Choice

Oil filled sectionalizers marked F-3 can be opened under load.

Explanation:
Sectionalizers are not built to interrupt live current. Their job is to wait for a fault, and after the upstream protective device has cleared the fault (typically after a certain number of recloses), they isolate the section. An oil-filled sectionalizer like F-3 is designed to open when the line is de-energized or after the fault is cleared and the current is essentially zero. Opening a device that isn’t rated to interrupt load current would cause an arcing and potential damage, so it should not be opened under load. That’s why the statement is not correct.

Sectionalizers are not built to interrupt live current. Their job is to wait for a fault, and after the upstream protective device has cleared the fault (typically after a certain number of recloses), they isolate the section. An oil-filled sectionalizer like F-3 is designed to open when the line is de-energized or after the fault is cleared and the current is essentially zero. Opening a device that isn’t rated to interrupt load current would cause an arcing and potential damage, so it should not be opened under load. That’s why the statement is not correct.

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