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Journeyman Electrician Exam (NEC-based)

Working space and installation: practice questions

Our Journeyman Electrician bank has 7 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Can panelboards be installed in clothes closets?

  1. Only in walk-in closets
  2. No
  3. Only with a GFCI
  4. Yes, always
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B. No — They also can't be in bathrooms (240.24).

Question 2

What is the minimum working space depth in front of a 120/240-volt panel with exposed live parts on one side and grounded parts on the other (Condition 2)?

  1. 2 feet
  2. 3½ feet
  3. 4 feet
  4. 3 feet
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D. 3 feet — Table 110.26(A)(1): at 0–150 V to ground the depth is 3 feet in all three conditions; 3½ and 4 feet apply at 151–600 V.

Question 3

Which entrance requirement applies to large equipment rooms with equipment rated 1,200 A or more and over 6 feet wide?

  1. No entrance required
  2. A ladder only
  3. An entrance at each end of the working space (or other permitted arrangement)
  4. One entrance only
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C. An entrance at each end of the working space (or other permitted arrangement) — Doors may need panic hardware (110.26(C)).

Question 4

What is the minimum width of working space in front of electrical equipment?

  1. 30 inches or the width of the equipment, whichever is greater
  2. 24 inches
  3. 36 inches
  4. 48 inches
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A. 30 inches or the width of the equipment, whichever is greater — The equipment need not be centred in the space.

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