To provide a stable wiring method by clearing the wiring by mounting a transformer with a plug on a table tap, aiming at space saving, and by eliminating a laterally laid state of the table tap.

In order to mount the transformer with a plug on the table tap, blade receptacles of the plug are mounted so as to cross a longitudinal direction of the table tap, and a part for mounting the transformer with a plug is arranged. It can be corresponded to the transformers of various size by changing distance of the blade receptacles. Ordinary plug receptacles corresponding to the transformers not having plug are also necessary, two rows of plug receptacles are arranged. Arrangement and wiring of inside metal fittings becomes easy when adding plug receptacles at same position in parallel. Since lower part of the part mounting the transformer with a plug excluding leg part is not necessary, the above part is cut as shown in the figure, and the cost is reduced.