Testing of an electrical circuit for voltage requires the supply to be energized.
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To test for resistance in a circuit, the circuit should be de-energized.
If the test shows that there is a continuity between the phase leg and the neutral with no load connected, then that circuit should not be energized. If the circuit was energized then the fuse or breaker protecting that leg will trip the circuit open.
This depends on whether the voltage is AC or DC but an oscilloscope is the tool of choice for seeing voltages and how they change with time.
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