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The chief practical advantage of a window or toroidal current transformer is that

  • A.it needs no core
  • B.it can be fitted without interrupting the supply to the circuit
  • C.the existing cable can be threaded through it
  • D.its ratio can be altered by changing the position of the cable in the window

Answer: C

The primary is the conductor itself, so there is nothing to wind and nothing to insulate. The cable must nevertheless be disconnected at one end to thread it through, unless a split core clamp type is used, which is the arrangement of a clip-on ammeter.

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