HONOLULU, HI — In commercial, residential, industrial, and institutional HVAC design, it is critical for design contractors and engineers to perform a load calculation. Not only is it important for ...

QUEBEC CITY - The great divide between HVAC contractors and engineers is probably at its widest point where residential load calculations are concerned. Contractors don't see a practical way to do ...

Requirements for branch circuits, feeders, and services each have their own Articles (210, 215, and 230, respectively). The NEC also contains an Article providing requirements for outside branch ...

Not long ago a residential load calculation — also known as a heat loss calculation or a load calc — was something you had the luxury of skipping. There was a good reason for avoiding it. It was ...

Bigger is not always better, especially when it comes time for you to install new central air conditioning. Choose a system that is just the right size for your home and its particular characteristics ...

WE'VE BEEN TALKING for the last three months about how to properly size a heat source when replacing oversized cast-iron boilers that once used solid fuel. They come with an existing castiron ...

The rules for feeder and service load calculations differ from those for branch-circuit calculations. Do you know the differences? With branch circuits (Art. 220, Part II), you’re basically ...