What is the maximum permitted OCPD to be installed for a single 120V branch circuit supplying two sign outlets that operate continuously each day?

What is the maximum permitted OCPD to be installed for a single 120V branch circuit supplying two sign outlets that operate continuously each day?

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

Answer: (B)

The key idea is sizing overcurrent protection for a continuous load. Since the two sign outlets operate continuously each day, treat that circuit as a continuous load and size the protective device accordingly. For sign circuits on a single 120 V branch, the rules allow up to a 25 A overcurrent protective device. This keeps the circuit practical for typical conductor sizes and avoids the need for heavier conductors that a 30 A device would require, while also ensuring the continuous load is adequately protected. Therefore, the maximum permitted OCPD is 25 A.

The key idea is sizing overcurrent protection for a continuous load. Since the two sign outlets operate continuously each day, treat that circuit as a continuous load and size the protective device accordingly. For sign circuits on a single 120 V branch, the rules allow up to a 25 A overcurrent protective device. This keeps the circuit practical for typical conductor sizes and avoids the need for heavier conductors that a 30 A device would require, while also ensuring the continuous load is adequately protected. Therefore, the maximum permitted OCPD is 25 A.