Question 188Electricity & Electronics - 1st Asst/Chief

The correct answer is B) 1000 VAC. According to the U.S. Coast Guard regulations, voltages above 1000 VAC are considered high voltage for the purposes of shipboard practice. This threshold is defined in the National Electrical Code (NEC), which is the standard adopted by the Coast Guard for electrical systems on vessels. The other options are incorrect because 440 VAC (A) is a common medium voltage used on ships, and 4160 VAC (C) and 6600 VAC (D) are even higher voltages that would be considered extra-high voltage, requiring additional safety precautions beyond the high voltage threshold of 1000 VAC.