A conductor with 220 mils of insulation would have what thickness of insulation in inches?

To convert from mils to inches, it is important to know that one mil is equal to one-thousandth of an inch. Therefore, to convert the insulation thickness from mils to inches, you divide the number of mils by 1,000.

In this case, the insulation thickness is given as 220 mils. Converting this to inches involves calculating:

220 mils ÷ 1000 = 0.220 inches.

This calculation confirms that the correct thickness of insulation is indeed 0.22 inches, making it the right choice. Understanding the conversion factor between mils and inches is crucial in electrical and instrumentation work, where insulation thickness can impact safety and performance.