How Many Circuits Do You REALLY Need? (15A vs 20A Explained)
How many general-use circuits do you actually need—and should they be 15 amp or 20 amp?
This is one of the most misunderstood calculations in the NEC, and it’s a common place where electricians make mistakes on both exams and real-world installations.
In this video, Paul from Electrical Code Academy breaks down how to determine the minimum number of general-use receptacle and lighting circuits using NEC 220.41, and explains the differences between 15A and 20A branch circuits.
Many electricians either guess or overcomplicate this process. This video simplifies it so you can apply it confidently.
If you’ve ever questioned how many circuits are required—or which size to use—this will make it clear.
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⚡ WHAT YOU’LL LEARN
How to calculate general-use circuits
15A vs 20A differences
NEC 220.41 explained simply
Common mistakes electricians make
How this applies to exams
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