Wiring Methods & Materials — Texas Journeyman Practice Questions

20 questions · 18% of the NEC Knowledge exam

Worked questions

1. What location classification applies to the interior of a raceway installed underground?

AIt is damp only when water is visible
BIt becomes dry when metal raceway is used
It is wet; use wet-location conductors
DIt is dry if the joints are glued

Why C is correct

Moisture can enter or condense in underground raceways even when joints are well made. The wiring method must therefore use conductor insulation identified for wet locations; raceway material does not change that classification.

2. For an angle pull containing large conductors, what primarily determines the required distance to the opposite wall?

AThe conductor insulation brand for the wiring method and location described
BThe box-cover paint color
Raceway trade sizes and their arrangement
DThe number of circuit breakers

Why C is correct

Angle- and U-pull dimensions are calculated from the raceway entries and arrangement so conductors can be pulled and bent without damage. Breaker count and appearance do not determine pull-box geometry.

3. Four AWG insulated conductors enter a cabinet through a raceway. What protection is generally required at the raceway end?

AOnly additional pulling lubricant for the wiring method and location described
BA neutral bonding screw
CA sharp threaded edge
A fitting that protects conductors from abrasion

Why D is correct

Where raceways contain 4 AWG or larger insulated conductors, an identified smooth insulating surface or fitting protects insulation from abrasion at the raceway termination.

4. Two copper conductors are twisted together and covered only with ordinary tape. What is missing?

AA second equipment label
An identified splicing device or other listed means
CA larger outlet cover
DA neutral-to-ground jumper for the wiring method and location described

Why B is correct

Conductor splices must use devices identified for the conductor material, size, number, and conditions, or another permitted method. Ordinary tape alone is not a listed wire connector.

16 more in the bank

Answers and explanations for these are in the app.

A cable emerges from a raceway sleeve with a sharp edge bearing on its jacket. What is required?
A cable passes through a framing hole too close to the nailing surface. What correction is appropriate?
A junction box containing conductor splices will be buried behind permanent finish. What must change?
A raceway is tied to ceiling-support wires not identified for electrical support. What should the installer do?
A raceway penetrates a tested fire-resistance-rated assembly. How should the opening be treated?
A raceway run has excessive total bends between pull points. What is the proper correction?
A white-insulated conductor is proposed as an ungrounded conductor without an allowed reidentification method. What should be done?
Several current-carrying conductors share one raceway in a hot space. Which effects must be evaluated?
When determining outlet-box fill, which items can require volume allowances in addition to insulated conductors?
A cable jacket is deeply cut during pulling, exposing damaged insulation. What is the proper response?
At a new outlet box, how much free conductor is generally required for splicing or device connection?
Before selecting burial depth for a branch circuit, what conditions must be checked in Table 300.5?
Conductors are installed in an outdoor raceway that appears watertight. How is the raceway interior classified?
May Type NM cable be installed in a raceway outdoors where the raceway interior is a wet location?
Type NM cable enters a single-gang nonmetallic box without an internal cable clamp. How close must it be secured to the box?
What information is needed to determine raceway fill for a conductor installation?

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