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Branch Circuits & Conductors — Texas Journeyman Practice Questions

20 questions · 18% of the NEC Knowledge exam

Worked questions

1. A required receptacle outlet is omitted because the owner plans to use an extension cord. Is that an acceptable design basis?

  • AYes, if the owner signs a waiver
  • BYes, if the cord is orange
  • No; an extension cord does not replace a required permanent outlet
  • DNo, because extension cords are never permitted for any use

Why C is correct

Required outlets reduce reliance on flexible cords as permanent wiring and must be installed where the applicable branch-circuit rule calls for them. A private preference does not remove that construction requirement.

2. Two ungrounded conductors sharing a neutral are placed on the same phase. What is the concern?

  • AThe breaker interrupting rating doubles
  • Their neutral currents can add instead of cancel and overload the shared conductor
  • CThe neutral current is always zero
  • DThe equipment ground carries the difference

Why B is correct

A multiwire circuit depends on the phase relationship of its ungrounded conductors. If they are on the same phase, the shared neutral can carry the sum of the loads rather than only the imbalance.

4. What branch circuit is generally required for dwelling-unit garage receptacle outlets?

  • At least one 20-ampere circuit dedicated as the rule permits
  • BOne shared 15-ampere lighting circuit for the branch circuit and occupancy described
  • CA 30-ampere dryer circuit
  • DNo circuit when parking is outdoors

Why A is correct

Dwelling garages require at least one 120-volt, 20-ampere branch circuit for receptacle outlets, with the permitted additional loads and exceptions controlled by the section.

16 more in the bank

Answers and explanations for these are in the app.

  • A branch-circuit conductor leaves a panel with no protection at its supply point and no tap rule applies. What is required?
  • A branch circuit supplies a continuous load and no special listed assembly changes the rule. What sizing principle applies?
  • A conductor has 90-degree-Celsius insulation, but the equipment terminal is limited to 75 degrees Celsius. What is the general final-ampacity principle?
  • A long branch circuit meets minimum ampacity but has unacceptable voltage drop at the load. What is the sound design correction?
  • A multiwire branch circuit supplies devices on the same yoke. What disconnecting feature is required for its ungrounded conductors?
  • A receptacle is installed in a location included by the current NEC GFCI rules. May a standard receptacle be used merely because it has an equipment ground?
  • A single receptacle is installed on an individual branch circuit. What rating principle applies?
  • A three-slot receptacle is replacing an old two-slot receptacle where no equipment-grounding path exists. Which method can be permitted?
  • A 20-ampere bathroom branch circuit supplies receptacles in two bathrooms. May it also supply the lighting in either bathroom?
  • A 75°C conductor ampacity is proposed on equipment marked only for 60°C conductors. Which limitation controls?
  • A multiwire branch circuit supplies line-to-neutral loads. What disconnecting feature is required?
  • A new 120-volt, 15-ampere bedroom branch circuit is installed in a dwelling. What protection is generally required?
  • A new dwelling has grade-level outdoor areas accessible from the ground. What receptacle provision is generally required?
  • A panel directory says only “miscellaneous” for most circuits. What correction is required?
  • An ungrounded two-slot receptacle is replaced with a GFCI-type receptacle where permitted. What additional action is required?
  • What is the purpose of the dwelling wall-space receptacle spacing rule?

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