What is the high side coil voltage for a transformer with a rating of 12470GrdY/7200-120/240?

The high side coil voltage of a transformer is determined by the higher voltage side listed in its rating. In this specific transformer rating of 12470GrdY/7200-120/240, the "12470GrdY" indicates that the high side is a grounded wye (GrdY) configuration with a line-to-neutral voltage.

In a grounded wye configuration, the line-to-neutral voltage is calculated by taking the full line-to-line voltage and dividing it by the square root of three (approximately 1.732). Therefore, for a transformer rated at 12470 volts, this represents the line-to-line voltage, which is the high side voltage.

Thus, the high side coil voltage in this case is indeed 12470 volts, as the choice specifically highlights the high voltage side of the transformer. The other options presented do not correspond to the high side rating of the transformer; 7200 volts is actually the lower voltage side of the transformer, while 40 volts and 240 volts refer to further secondary distribution or utilization voltages. Understanding the transformer ratings and the configuration helps clarify the specific high side coil voltage.