Before 1950, what was the common electrical service amperage found in residential buildings?

In residential buildings constructed before 1950, the common electrical service amperage was typically around 60 amps. This was largely due to the prevailing electrical demands at the time, which were lower compared to modern standards. The 60-amp service was adequate for the basic electrical needs of households, accommodating lighting and a few appliances, such as refrigerators and stoves.

As technology evolved and the number of electrical devices in homes increased, the demand for higher amperage services also grew, leading to the standardization of 100 amps and higher in later decades. Understanding this historical context helps underscore how residential electrical systems have progressed to meet modern usage requirements, which often include multiple large appliances, heating and cooling systems, and a greater reliance on electronics.

The values for the other options do not reflect typical services for homes built prior to 1950, as those amperages were not standard during that time.