What is the typical ampere rating range for branch circuits?

• A. 10 to 30 amperes
• B. 15 to 50 amperes
• C. 20 to 60 amperes
• D. 25 to 75 amperes

Answer: (B)

Branch circuits come in standard breaker sizes to match typical loads from outlets, lighting, and small equipment. In everyday installations, you most often see general-purpose circuits rated at 15 A or 20 A. For larger loads and dedicated appliances, higher ratings like 30 A, 40 A, or up to 50 A are used. A 60 A rating exists for heavier applications, but it’s not the typical size for a standard branch circuit, and lower sizes like 10 A aren’t aligned with common residential loads. Because you’ll encounter the broadest mix of general-use and larger appliance circuits, the practical range for branch circuits is about 15 to 50 amperes.