Which constant is used for aluminum conductors in voltage drop calculations?

In voltage drop calculations, the appropriate constant for aluminum conductors is based on the specific resistivity characteristics of aluminum. The value of 21.2 is derived from the electrical properties of aluminum, specifically its resistance per unit length when calculating the voltage drop over a certain distance.

This constant is particularly important in ensuring that the design of electrical systems maintains efficiency and safety. Using the correct constant ensures that the voltage drop remains within acceptable limits, preventing potential issues such as equipment malfunction or inefficiencies.

The other values do not correspond to aluminum conductors and may apply to other materials or contexts, reinforcing the necessity of using the correct constant based on the type of conductor being evaluated.