Fluke 43B
Applications Manual
30
If the measured K-factor is higher than the K-factor specified on the
transformer, you either must replace the transformer by a transformer with a
higher K-rating, or reduce the maximum load on the transformer.
When choosing a replacement transformer, use the next trade-size higher than
the highest measured K-factor. For example, a measurement of 10.3 KF on an
installed transformer means replacing it with a K-13 unit.