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The secondary of a potential transformer must never be

  • A.connected to more than one instrument at a time
  • B.short circuited
  • C.left open circuited
  • D.earthed at any point

Answer: B

A short circuit on a voltage source draws an enormous current and destroys the winding, which is why a potential transformer secondary is fused. The rule is precisely the reverse of the current transformer rule, and confusing the two is a classic and dangerous error.

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