Free NEC Standard Method Single Family Residential – Electric Service Entrance Load Calculator
Enter plain numbers in cells without text or labels. If you leave any cells empty they will be calculated as zero.
What is this Load Calculator for? Electricity is delivered to your home by the Service Entrance which is sized based upon calculations dictated by the NEC and the local codes authoritys along with the electric utility provider. Most jurisdictions use the NEC standard method calculations without significant modification. There is nothing about the calculations which are difficult to do by hand with only a pencil and calculator, but each calculation has quite a few steps, and can take a while to do – especially if you aren’t familiar with it.
This automated calculator makes it much quicker and easier to try different scenarios which can be quite useful if you’re planning a remodelling or addition project. Sometimes using more energy efficient fixtures appliances, and HVAC equipment along with upgraded insulation and weather proofing can help you to avoid retrofitting a new larger service entrance and significant expense.