Branch Circuit Sizing and NEC Compliance Quiz
hard
10 Questions
Question 1 of 10
According to NEC 210.19(A)(1), what is the multiplier applied to a continuous load for conductor sizing?
NEC 210.19(A)(1) requires that branch circuit conductors be sized at 125% of the continuous load current.
Question 2 of 10
Which of the following is considered a continuous load according to the article?
The article defines a continuous load as one that is expected to continue for 3 hours or more.
Question 3 of 10
What is the formula for current (I) in a single-phase circuit when Power (P) and Voltage (V) are known?
Based on Ohm's Law for power, Current equals Power divided by Voltage (I = P/V).
Question 4 of 10
What is the correct formula to calculate current for a three-phase resistive load?
The power formula for a three-phase system is P = ?3 × V × I. Therefore, I = P / (?3 × V).
Question 5 of 10
If a load draws 16A continuously, what is the minimum required rating for the overcurrent protection device?
16A continuous load multiplied by 125% equals 20A.
Question 6 of 10
When sizing equipment grounding conductors (EGC), which NEC table is typically referenced?
The article specifically references NEC Table 250.122 for determining the size of the equipment grounding conductor.
Question 7 of 10
Under what condition can you ignore the 125% rule and size a breaker/wire directly to the load current?
For non-continuous loads, such as hair dryers or lighting, the breaker and conductor may be rated equal to the load current.
Question 8 of 10
Which of the following is explicitly excluded from the sizing methods discussed in this article?
The article states that motor circuits, controllers, and wire sizing requirements differ significantly and are excluded from these specific guidelines.
Question 9 of 10
What happens to the wire size requirement if you use the 125% rule for a 16A continuous load versus a non-continuous load?
The 125% rule increases the calculated current, which typically requires a higher ampacity rating and thus a larger wire size for continuous loads.
Question 10 of 10
What is the approximate value of ?3 used in three-phase power calculations?
The square root of 3 (?3) is approximately 1.732, used for calculating three-phase power and current.
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