Which statement best reflects the relationship between feeder loads in schools and portable classroom buildings?

• A. Calculations that also apply to portable classroom buildings.
• B. Calculations that apply only to permanent structures.
• C. Calculations that are not applicable to portable facilities.
• D. Calculations that require entirely different methods for portable buildings.

Answer: (A)

Feeder load calculations for a school apply to portable classroom buildings as well. The same method is used to size feeders and service equipment, because portable classrooms are part of the same facility and are served by the same electrical system. They contain the same types of loads—lighting, receptacles, possibly HVAC or specialized equipment—and those loads are included in the overall demand calculations just like those in permanent classrooms. So the calculation framework doesn’t change; you apply the same NEC-style load calculations and demand factors to the portable spaces. The idea that you’d use a completely different method or that these calculations aren’t applicable isn’t consistent with how load sizing is performed for a school campus.