When replacing a defective transformer in a paralleled transformer configuration, which of the following actions must be carried out to insure proper operation of the equipment it serves? |
A) The iron core of the transformer must be flashed to pre-magnetize it. |
B) The transformer connections must be made as before with regard to the indicated polarity. |
C) The secondary leads must be grounded for 10 minutes to remove static charges. |
D) The iron core must be grounded for 10 minutes to remove any residual magnetism. |