What is the circular mil of a wire that is 1 inch in diameter?

To determine the circular mils of a wire that is 1 inch in diameter, we must first understand how to calculate circular mils. A circular mil is a unit of area used specifically for measuring the cross-sectional area of wire.

The formula for calculating the area in circular mils is given by:

[ \text{Area (circular mils)} = D^2 ]

where ( D ) is the diameter in mils. Since there are 1000 mils in an inch, a 1-inch diameter wire is equal to 1000 mils.

Now, applying the formula:

[ \text{Area} = 1000^2 = 1,000,000 ]

Thus, the area of a wire that is 1 inch in diameter is 1,000,000 circular mils.

This calculation confirms that the answer indicating 1,000,000 circular mils is indeed accurate. Understanding this formula and conversion is crucial for linemen when determining wire sizes and their capacities in various electrical applications.