Texas Journeyman Electrician Practice Test (Free) | ExamsLib

Question 1

A building has a concrete-encased electrode (Ufer ground) consisting of 20 ft of 4 AWG bare copper encased in the concrete footings. A ground rod at the same location can only be driven to 6 ft before hitting bedrock. Under NEC 250.53(G), which of the following correctly describes the permitted installation of that ground rod?

Accepted Answer

The rod may be driven at an angle not exceeding 45 degrees from vertical, or buried horizontally at least 30 inches deep, and still qualifies as an electrode

Answer

The rod must be rejected; only the concrete-encased electrode may be used when rock prevents full depth

Answer

A second concrete-encased electrode must replace the rod whenever rock is encountered within 8 ft of grade

Answer

The rod must be extended with a coupling to reach a minimum depth of 8 ft below the rock surface

Question 2

Using the NEC optional method (220.82) for a 240-volt single-phase service, the first 10 kVA of total calculated load is taken at 100% and the remainder at 40%. If a home's total connected load before demand factors is 48 kVA, what is the minimum calculated demand load in kVA?

Accepted Answer

23.2 kVA

Answer

19.2 kVA

Answer

25.6 kVA

Answer

30.4 kVA

Question 3

Two separate buildings on the same property are supplied from a common service. An equipment grounding conductor is run with the feeder to the second building. Which statement is correct regarding the neutral-to-ground bond at the second building's panelboard?

Accepted Answer

No neutral-to-ground bond is permitted at the second building if an EGC is run with the feeder

Answer

A neutral-to-ground bond is required at the second building to protect against open-neutral faults

Answer

The bond is required only when the feeder is longer than 100 ft

Answer

The bond is optional at the second building if a ground rod is installed there

Question 4

When calculating the minimum number of small-appliance branch circuits for a dwelling's kitchen and dining areas, the NEC specifies at least how many 20-ampere circuits?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four

Question 5

Six 12 AWG THHN current-carrying conductors are run in a single EMT conduit at an ambient temperature of 40 degrees C. Using NEC Table 310.16 (90 degrees C column base ampacity of 30 A), the 40 degrees C temperature correction factor of 0.91, and the 6-conductor adjustment factor of 0.70, what is the corrected ampacity?

Accepted Answer

19.1 A

Answer

21.0 A

Answer

27.3 A

Answer

16.4 A

Question 6

Which conductor in a standard branch circuit is used to bond metal equipment enclosures back to the panel?

Accepted Answer

The equipment grounding conductor (EGC)

Answer

The ungrounded (hot) conductor

Answer

The grounded (neutral) conductor

Answer

The system bonding jumper

Question 7

What is the maximum number of current-carrying conductors permitted in a conduit before a conduit-fill ampacity adjustment factor must be applied per NEC 310.15(C)?

Accepted Answer

3

Answer

2

Answer

6

Answer

4

Question 8

When applying the NEC standard method to a dwelling unit, what volt-ampere (VA) per square foot value is used for general lighting and receptacle loads?

Accepted Answer

3 VA per square foot

Answer

1 VA per square foot

Answer

2 VA per square foot

Answer

5 VA per square foot

Question 9

Conduit fill rules limit the cross-sectional area conductors may occupy. For three or more conductors in a new raceway installation, what is the maximum fill percentage allowed by NEC Chapter 9?

Accepted Answer

40%

Answer

31%

Answer

60%

Answer

53%

Question 10

According to NEC Article 100 definitions, what does 'bonding' accomplish?

Accepted Answer

It establishes electrical continuity and conductivity between metal parts

Answer

It connects the grounded conductor to the earth electrode

Answer

It limits the voltage to ground on ungrounded conductors

Answer

It provides a dedicated path for lightning surges to reach earth

Texas Journeyman Electrician Practice Test

Question 1

Question 2

Using the NEC optional method (220.82) for a 240-volt single-phase service, the first 10 kVA of total calculated load is taken at 100% and the remainder at 40%. If a home's total connected load before demand factors is 48 kVA, what is the minimum calculated demand load in kVA?

Question 3

Two separate buildings on the same property are supplied from a common service. An equipment grounding conductor is run with the feeder to the second building. Which statement is correct regarding the neutral-to-ground bond at the second building's panelboard?

Question 4

When calculating the minimum number of small-appliance branch circuits for a dwelling's kitchen and dining areas, the NEC specifies at least how many 20-ampere circuits?

Question 5

Question 6

Which conductor in a standard branch circuit is used to bond metal equipment enclosures back to the panel?

Question 7

What is the maximum number of current-carrying conductors permitted in a conduit before a conduit-fill ampacity adjustment factor must be applied per NEC 310.15(C)?

Question 8

When applying the NEC standard method to a dwelling unit, what volt-ampere (VA) per square foot value is used for general lighting and receptacle loads?

Question 9

Conduit fill rules limit the cross-sectional area conductors may occupy. For three or more conductors in a new raceway installation, what is the maximum fill percentage allowed by NEC Chapter 9?

Question 10

According to NEC Article 100 definitions, what does 'bonding' accomplish?

Question 11

A 480-volt, 3-phase, 30-horsepower Design B squirrel-cage induction motor has a table FLC of 40 A per NEC Table 430.250. Using NEC Table 430.52, what is the maximum standard-size inverse time circuit breaker permitted for this motor's branch circuit short-circuit and ground-fault protection?

Question 12

A metal water pipe enters a building and is used as a grounding electrode. The pipe must be supplemented with an additional electrode when a water meter or other isolating fitting is located within what distance of the point of entry into the building?

Question 13

Structural steel that is grounded and interconnected to form a metal building frame may serve as a grounding electrode. What minimum length of steel must be in direct contact with the earth to qualify under NEC 250.52(A)(2)?

Question 14

A single-family dwelling has 2,400 sq ft of living space. Using the NEC standard method, what is the calculated general lighting and receptacle load before any demand factors are applied?

Question 15

At a separately derived system (such as a transformer secondary), where is the system bonding jumper required to be installed?

Question 16

A 240-volt, single-phase household electric range is rated at 12 kW. Using NEC Table 220.55 Column C (one range), what demand load is used for service calculations?

Question 17

An equipment grounding conductor run with a 60-ampere branch circuit must have a minimum copper size of:

Question 18

A GFCI receptacle is required by the NEC in which of the following dwelling unit locations?

Question 19

A 208-volt, 3-phase induction motor has a nameplate full-load current (FLC) of 18 amperes. What is the minimum branch circuit conductor ampacity required by the NEC?

Question 20

On a Texas residential service, the grounding electrode conductor connects the grounded service conductor to what?