Which of the following statements is true regarding branch circuits rated at 30 amperes?

The correct statement regarding branch circuits rated at 30 amperes is that they must supply a maximum of 24 amp devices. This is in line with the National Electrical Code (NEC), which requires that continuous loads (defined as loads that operate for three hours or more) must not exceed 80% of the branch circuit rating.

In this case, if a branch circuit is rated for 30 amperes, the maximum continuous load it should support is 24 amperes (30 amperes x 0.80 = 24 amperes). This ensures that the circuit operates safely without overloading and potentially causing overheating or other hazards.

Understanding this limitation is critical for ensuring compliance with electrical safety standards and proper circuit design. Always remember that the amperage rating of a circuit serves as a guideline for the maximum load that can be safely connected to that circuit.