One-Family Dwelling Unit Load Calculations

One-Family Dwelling Unit Load Calculations

When making dwelling unit load calculations, it’s critical to use the correct demand factors.

Before you can size the branch circuits for a dwelling, you must calculate the loads. Article 220 allows two distinctly different calculation methods: the standard method in Part III and the optional method in Part IV. They typically give different results.

The standard method

Follow these steps below to determine the feeder or service size for a dwelling unit using the standard method [Art. 220, Part III]:

Step 1: The NEC recognizes that general

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