Final answer:
For a branch circuit with both noncontinuous and continuous loads, it must be sized for 100% of the noncontinuous load and 125% of the continuous load as per NEC guidelines.
Step-by-step explanation:
When a branch circuit feeds both noncontinuous and continuous loads, it must be sized to accommodate 100% of the noncontinuous load plus 125% of the continuous load according to the National Electrical Code (NEC).
This means that if there are significant loads that are expected to run for three hours or more continuously, the branch circuit should have the capacity to handle an additional 25% of that continuous load to prevent circuit overload and ensure safety. Ensuring circuits are properly sized is critical for preventing electrical fires and maintaining system integrity.