Power-limited equipment circuit limitations are verified by ?

• A. The testing laboratory
• B. The electrical contractor
• C. The building owner
• D. The local fire marshal

Answer: (A)

Power-limited circuit limits are set and verified through the listing process conducted by a recognized testing laboratory. These labs test equipment to ensure that, when used on a power-limited circuit, the total power draw stays within the allowed limits under normal and fault conditions, and they publish PL ratings that installers use in design. The contractor and building owner implement the system according to those ratings, and the local fire marshal enforces compliance, but the formal verification of PL limits comes from the testing laboratory’s evaluation and certification.