Which branch-circuit rating is NOT permitted for lighting and receptacle circuits in dwelling unit(s)?

Which branch-circuit rating is NOT permitted for lighting and receptacle circuits in dwelling unit(s)?

• A. 15 A
• B. 20 A
• C. 30 A
• D. 25 A

Answer: (D)

In a residential setting, the ampacity ratings for branch circuits are typically standardized to ensure safety and compatibility with the devices being used. When it comes to lighting and receptacle circuits specifically, the National Electrical Code (NEC) sets forth certain guidelines for the allowed ratings. A circuit rated at 15 A or 20 A is commonly used for both lighting and receptacle circuits in dwelling units. The 15 A circuits are especially prevalent for most lighting applications, while 20 A circuits can accommodate more demanding receptacle loads. However, a 30 A circuit is generally reserved for larger appliances that draw significant power and is not suitable for general lighting or receptacle use in homes. Similarly, a rating of 25 A is not standard and doesn’t conform to typical residential electrical practices governed by the NEC. Instead, the circuit ratings are generally incremented in 5 A steps, making 25 A an unusual choice for residential lighting and receptacle circuits. Thus, the only branch-circuit rating that is not permitted for lighting and receptacle circuits in dwelling units is 25 A, as it does not align with the common configurations established by the NEC for this type of application.

In a residential setting, the ampacity ratings for branch circuits are typically standardized to ensure safety and compatibility with the devices being used. When it comes to lighting and receptacle circuits specifically, the National Electrical Code (NEC) sets forth certain guidelines for the allowed ratings.

A circuit rated at 15 A or 20 A is commonly used for both lighting and receptacle circuits in dwelling units. The 15 A circuits are especially prevalent for most lighting applications, while 20 A circuits can accommodate more demanding receptacle loads.

However, a 30 A circuit is generally reserved for larger appliances that draw significant power and is not suitable for general lighting or receptacle use in homes. Similarly, a rating of 25 A is not standard and doesn’t conform to typical residential electrical practices governed by the NEC. Instead, the circuit ratings are generally incremented in 5 A steps, making 25 A an unusual choice for residential lighting and receptacle circuits.

Thus, the only branch-circuit rating that is not permitted for lighting and receptacle circuits in dwelling units is 25 A, as it does not align with the common configurations established by the NEC for this type of application.