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Journeyman Electrician Exam (NEC-based)

Wiring methods and conductors: practice questions

Our Journeyman Electrician bank has 45 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

How often must MC cable be supported?

  1. Within 3 feet of boxes
  2. Every 4½ feet
  3. Every 10 feet
  4. Within 12 inches of each box and at intervals not exceeding 6 feet
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D. Within 12 inches of each box and at intervals not exceeding 6 feet — See 330.30.

Question 2

Why must PVC conduit runs exposed to temperature changes often include expansion fittings?

  1. PVC expands and contracts significantly with temperature
  2. To ground the conduit and bond it to the boxes at each end of the run
  3. To allow pulling
  4. To seal out water
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A. PVC expands and contracts significantly with temperature — See 352.44.

Question 3

Which wiring method is commonly used in residential construction?

  1. Cable tray
  2. Busway
  3. Rigid metal conduit only, in all occupancies
  4. NM (non-metallic sheathed) cable
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D. NM (non-metallic sheathed) cable — It's permitted in most one- and two-family dwellings.

Question 4

What is the minimum free length of conductor at a box for splices or devices?

  1. 12 inches
  2. 2 inches
  3. 6 inches
  4. 3 inches
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C. 6 inches — At least 3 inches must extend outside the box opening (300.14).

Question 5

Can flexible cords be used as a substitute for the fixed wiring of a building?

  1. Yes, if run through walls
  2. Yes, if they're heavy duty
  3. Yes, in garages
  4. No
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D. No — See 400.12.

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