Power-system progress for commercial buildings

ELECTRICAL LOADS in commercial buildings have grown in intensity so they now are equivalent to the load density of a metal-working industrial plant. With the advent of air conditioning in the commercial building, the type of equipment supplied by the power system is also similar to that found in an industrial plant. The logical question then is why should the same engineering principles not apply in both cases—that is, small load-center substations should be located throughout the commercial building, and should supply the load at the higher voltage.