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Equipment special practice questions

48 questions from the nec code knowledge (2023) practice test.

Equipment special practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

In which conductor must the switching for three-way and four-way switches be done?

  1. Only in the grounded conductor
  2. In both of the circuit conductors
  3. In the equipment grounding conductor
  4. Only in the ungrounded conductor
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D. Only in the ungrounded conductor

Three-way and four-way switches are wired so all switching is in the ungrounded conductor. Switching the grounded conductor would leave the load energized with respect to ground when it is off.

Reference: NEC 2023, 404.2(A)

Why does the Code generally call for a grounded conductor at switch locations that control lighting loads?

  1. So electronic controls have a neutral for standby current
  2. So the switch can interrupt both of the circuit conductors
  3. So the metal faceplate has a second path to ground
  4. So the voltage drop to the luminaire is kept lower
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A. So electronic controls have a neutral for standby current

Many occupancy sensors, timers and dimmers draw a small standby current. With a neutral in the box, they do not have to return that current over the equipment grounding conductor.

Reference: NEC 2023, 404.2(C)

A 15 A, 125 V receptacle is installed outdoors where it is exposed to rain. What is required?

  1. A standard receptacle with a flip-lid cover
  2. A twist-lock receptacle with a rubber boot
  3. A GFCI receptacle with an ordinary faceplate
  4. A weather-resistant receptacle with an in-use cover
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D. A weather-resistant receptacle with an in-use cover

In wet locations the enclosure must be weatherproof whether or not a plug is inserted, and the receptacle must be listed weather-resistant. A flip lid protects only while nothing is plugged in.

Reference: NEC 2023, 406.9(B)(1)

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