Question 265Electricity & Electronics - Assistant Engineer

The correct answer is C) The voltage would have to rise to a value ranging from any voltages between 382.5 VAC and 427.5 VAC. This is because according to 46 CFR Subchapter J, the emergency generator output voltage must rise to a value between 85% and 110% of the normal system supply voltage of 450 VAC in order to trigger the automatic transfer of emergency loads. 85% of 450 VAC is 382.5 VAC, and 110% of 450 VAC is 427.5 VAC, so the emergency generator voltage must rise to a value between these two thresholds to initiate the automatic transfer. The other options are incorrect because A) specifies a single value instead of a range, B) specifies a value higher than the allowable range, and D) specifies a range that is too broad and includes voltages outside the regulatory requirements.