THE FIRST STEP when specifying and recommending a residential heating system is to determine the heat load for the project. Here is software that can speed that process and guarantee accuracy.

Whether they're for journeymen, master electricians, or contractors, most electrical licensing exams require you to calculate residential loads and service or feeders sizes using one of two methods.

Mlulti-family service calculations can seem confusing, especially since you have a choice of methods — standard (Art. 220, Part II) and optional (Art. 220, Part III). But clearing up that confusion is ...