Question 1109 of 790 · California General Electrician Exam
A 480Y/277-volt panelboard has exposed live parts on one side of the working space and a grounded concrete wall on the other (Condition 2). What is the minimum depth of working space?
Exactly one answer is correct.
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Correct answer to question 1109
- B: 3.5 feet
Explanation
Table 110.26(A)(1) requires 3.5 feet for Condition 2 at 277 volts to ground (the 151 to 600 V column in NEC 2020, the 151 to 1000 V column in NEC 2023). Condition 1 would be 3 feet and Condition 3 would be 4 feet.
More questions: Definitions, Theory and Plans
- 1110Equipment at 277 volts to ground has exposed live parts on both sides of the working space (Condition 3). The minimum working space depth is:
- 1111What is the minimum width of the working space in front of electrical equipment covered by 110.26(A)?
- 1112For service equipment and panelboards, the minimum headroom of the working space is generally:
- 1113A homeowner stacks storage boxes in the working space in front of a panelboard. Under 110.26, this is:
- 1114For equipment rated 1200 amperes or more and over 6 feet wide containing overcurrent devices or switching devices, 110.26(C)(2) generally requires:
- 1115NEC 110.12 requires electrical equipment to be installed: