Question 7049 of 749 · Maryland Journeyperson Electrician Exam
A 4500 watt, 240 volt storage water heater is installed. What minimum ampacity must the branch circuit provide?
Exactly one answer is correct.
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Correct answer to question 7049
- C: 23.4 A
Explanation
The heater draws 4500 W divided by 240 V, which is 18.75 A. Section 422.13 requires 125 percent, so 18.75 A times 1.25 gives 23.4 A. A 25 or 30 ampere circuit with suitable conductors meets this.
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