In Informative Annex D Example D1(a), what is the calculated load for neutral in a one-family dwelling?

In Informative Annex D Example D1(a), the calculated load for the neutral in a one-family dwelling is derived from specific load calculations based on the dwelling unit's electrical demand. The neutral current in a residential setup is influenced by the sum of branch circuits and the balanced load on those circuits.

The correct calculated load of 61 A for the neutral is reached through a detailed application of the applicable codes and standards which take into consideration various factors such as the types of loads, their usage diversity, and the number of circuits serving different functions within the dwelling. In residential electrical design, the neutral load is often lower than the sum of the individual phase loads due to the cancellation effect from loads that are typically in use at different times, leading to an overall calculation of 61 A.

This method of calculating the neutral load helps ensure that the electrical system is not only safe but is correctly sized to handle the expected loads without overloading the neutral conductor. It considers the characteristics of typical residential wiring and the anticipated patterns of electrical usage.