What is the maximum amount of current that an appliance on a 20-amp branch circuit should draw?

• A. 20 amps
• B. 16 amps
• C. 18 amps
• D. 25 amps

Answer: (B)

In electrical systems, it is crucial to observe the concept of continuous load and safe usage of branch circuits. A 20-amp branch circuit should not be loaded to its full capacity to ensure safety, prevent overheating, and allow for the potential use of the circuit without tripping the breaker.

According to the National Electrical Code and general safety practices, a maximum of 80% of the circuit's rating is typically recommended for continuous load applications. Therefore, for a 20-amp branch circuit, the calculation would be 20 amps multiplied by 0.8, resulting in a maximum recommended current draw of 16 amps. This ensures that the circuit operates efficiently and reduces the risk of overload, which could lead to damage or fire hazards.

Thus, the choice indicating 16 amps aligns with safety guidelines, ensuring that the appliance draws a current that is well within the safe operating limits of the circuit.