Question 7062 of 731 · Texas Journeyman Electrician Exam
A 480Y/277 volt panelboard faces a concrete wall across the working space (Condition 2). What is the minimum working space depth?
Exactly one answer is correct.
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Correct answer to question 7062
- B: 3 1/2 ft
Explanation
At 277 volts to ground the 151 to 600 volt column applies. Concrete is considered grounded, which makes it Condition 2, and Table 110.26(A)(1) requires 3 1/2 ft.
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