Quiz: 2024 International Residential Code (IRC) Chapter 37 Branch Circuit And Feeder Requirements

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1. According to Section E3701.1, what percentage of the total dwelling unit load do the branch circuits and feeders covered by Chapter 37 serve?

Exactly 100 percent
Less than 100 percent
More than 100 percent
Between 50 and 75 percent

2. When a branch circuit supplies a combination of continuous and noncontinuous loads, what is the minimum ampacity required for the conductor size regarding the continuous load?

100 percent of the continuous load
115 percent of the continuous load
125 percent of the continuous load
130 percent of the continuous load

3. Which of the following statements is true regarding the sizing of grounded conductors of feeders that are not connected to an overcurrent device?

They must be sized at 125 percent of the continuous load.
They must be sized at 100 percent of the continuous and noncontinuous load.
They must be sized at 80 percent of the continuous and noncontinuous load.
They require an ampacity adjustment factor of 0.8.

4. If more than one calculated or tabulated ampacity applies for a given circuit length, which value must be used?

The highest value
The average value
The lowest value
The value corresponding to the highest temperature rating

5. Under what condition is it permitted to use a higher ampacity for portions of a circuit with lower ampacity?

When the total portion with lower ampacity exceeds 20 feet.
When the total portion with lower ampacity does not exceed the lesser of 10 feet or 10 percent of the total circuit.
When the circuit is for continuous loads only.
When the circuit is entirely within a single raceway.

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