What is the maximum percentage of circuit rating that fixed appliances can occupy on a multioutlet circuit rated 15 or 20A?

In residential wiring, the National Electrical Code specifies that fixed appliances can occupy a maximum of 50 percent of the circuit rating on a multioutlet circuit rated for 15 or 20 amps. This limitation is in place to ensure that the circuit can accommodate additional devices that might be plugged in and to prevent potential overloads that could cause overheating or tripping the breaker.

By restricting fixed appliances to 50 percent of the circuit capacity, the code promotes safety and reliability in electrical installations. This approach ensures that there is sufficient spare capacity for any transient loads or additional equipment that may be introduced later, thus reducing the risk of circuit failure.

The percentages provided in the other options do not align with NEC guidelines for multioutlet circuits with fixed appliances. Therefore, understanding the rationale behind the 50 percent rule is crucial for maintaining safe and effective electrical systems in residential settings.