Question 474Electricity & Electronics - QMED

The correct answer is D) no refurbishment or replacement was necessary through 2011. The illustrated plots show that the insulation resistance, even when corrected for temperature, remained above the minimum acceptable level through 2011. According to Coast Guard regulations, there is no requirement to refurbish or replace equipment as long as the insulation resistance stays within acceptable limits. Since the insulation resistance did not drop below the minimum threshold during the time period shown, no refurbishment or replacement was necessary. The other answer choices are incorrect because they suggest the equipment needed to be serviced at earlier time points, even though the data indicates the insulation resistance was maintained at safe levels.