As we said last month, electrical theory underlies everything we do in the electrical construction business. It is therefore necessary to review this theory regularly. We continue now with Ohm's Law.

In last month's “Code Basics” article, starting on page 56 of the September issue, we spent most of our time discussing Class 1 circuits. Now, it's time to switch gears and focus on Class 2 and 3.

IN following the standard set in this series of monographs, the author gives us a tidy, critical, and slightly historical account of the basis of operational calculus as devised by Oliver Heaviside.