Answer / raghavendran.r

"Hipot" is short for high potential (high voltage). A hipot
test checks for "good isolation." You do a hipot test by
making sure no current will flow from one point to another
point. In some ways a hipot test is the opposite of a
continuity test.
Hipot testers usually connect one side of the supply to
safety ground (Earth ground). The other side of the supply
is connected to the conductor being hipoted. With the
supply connected like this there are two places a given
conductor can be connected: high voltage or ground.

I have seen 1 video in which a person getting shock while standing at top of a train,i have 1 question? why the people sitting in the train doesn't get shock while that man getting shock from top of the train? How the earthing of train works?

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