Equipment & Devices — Texas Journeyman Practice Questions

20 questions · 18% of the NEC Knowledge exam

Worked questions

1. A maintenance disconnect is required to be within sight from equipment. What does within sight generally mean?

AOnly visible on a drawing
BAnywhere in the same building
CWithin 500 feet even through walls
Visible and within 50 feet

Why D is correct

The defined phrase combines visibility with a maximum distance of 50 feet. A remote device hidden by walls or merely shown on plans does not let the worker verify its position while servicing equipment.

2. Equipment instructions specify a terminal torque. How should the connection be completed?

ATighten as hard as possible
BUse hand feel only
Use the specified torque with a suitable tool
DLubricate every conductor regardless of instructions

Why C is correct

Specified torque is part of the identified installation and avoids both loose heating connections and damaged lugs. Guessing, overtightening, or unapproved lubricant can change clamping force and invalidate the connection.

3. Indoor-rated equipment is proposed outdoors beneath a small awning. What must be verified?

An assembly identified for outdoor conditions
BOnly conductor color matters
CA larger breaker makes the enclosure weatherproof
DThe awning automatically converts it to outdoor equipment

Why A is correct

Outdoor exposure can include rain, condensation, sun, and corrosion despite an awning. The enclosure, fittings, and associated components must carry ratings suitable for the environment; field assumptions cannot create a listing.

4. Replacement equipment has adequate ampacity but an insufficient short-circuit rating. May it be installed?

AYes, because normal load is lower
BYes, if a larger equipment ground is installed
No; its fault-current rating must be adequate for the installation
DYes, if a warning label is added

Why C is correct

Ampacity addresses normal current, while short-circuit rating addresses fault energy. Grounding size and labels do not increase tested withstand or interrupting capability.

5. A paddle fan is proposed on an outlet box that is listed only for luminaire support. What is required?

AUse longer cover-plate screws
BReduce the fan speed setting
CSupport the fan from branch conductors
Use a box or support system listed for ceiling-suspended fans

Why D is correct

A ceiling-suspended fan imposes dynamic mechanical loads that an ordinary luminaire box may not be evaluated to carry. The outlet box or independent support must be identified for fan support and the fan weight.

6. A permanently connected appliance requires servicing while energized parts could be exposed. What must the disconnecting means provide?

A permitted means to prevent unexpected energization
BA neutral fuse only
CA receptacle on another circuit for the listed equipment in normal service
DA larger appliance nameplate

Why A is correct

The appliance disconnect must be within sight or capable of being locked in the open position where the article permits. The goal is control of unexpected energization during service.

7. Equipment is 40 inches wide. What minimum working-space width generally applies in front of it?

AHalf the equipment width
BExactly 24 inches
At least 30 inches or the equipment width, whichever is greater
DOnly enough room to open one door for the listed equipment in normal service

Why C is correct

Working-space width is generally at least 30 inches or the equipment width, whichever is greater, and need not be centered. Doors and hinged panels must also open as required.

8. May a single 20-ampere receptacle be installed on an individual 15-ampere branch circuit when its connected load is permitted?

ANo; every individual circuit needs equal ratings for the listed equipment in normal service
BOnly when two receptacles share the yoke
CNo; it must be exactly 15 amperes
Yes; the single receptacle rating is not less than the branch rating

Why D is correct

For a single receptacle on an individual branch circuit, the receptacle rating must not be less than the branch-circuit rating. A 20-ampere receptacle is not less than a 15-ampere circuit, while the connected load must still comply with the applicable limits.

9. What feature prevents a standby generator from backfeeding the normal utility source?

AA warning label alone
Approved transfer equipment or interlocking
CA larger grounding electrode for the listed equipment in normal service
DA portable extension cord

Why B is correct

Transfer equipment or an approved interlock prevents unintended parallel connection of normal and alternate sources. Instructions and labels do not physically prevent dangerous backfeed.

11 more in the bank

Answers and explanations for these are in the app.

A luminaire is heavier than the outlet box’s marked support rating. What is required?
A required surge-protective device is connected with unnecessarily long looped leads. Why should the layout be corrected?
An outdoor receptacle cover is weatherproof only when no plug is inserted. What should be verified?
For listed air-conditioning equipment, which marking normally controls branch-circuit conductor and breaker selection?
Permanent storage cabinets occupy the required working space in front of a panelboard. Is the arrangement acceptable?
Stored material blocks a dry-type transformer’s ventilation openings. What is the appropriate response?
A listed panelboard is modified by drilling through an internal bus support. What must be established before use?
A required equipment disconnect is blocked by permanently installed piping. What should be corrected?
May a suspended-ceiling grid support a luminaire without independent support when the grid system is not identified for that purpose?
When must a panel circuit directory be updated?
Where is the disconnect for air-conditioning equipment generally located?

Practice all 20 Equipment & Devices questions

Plus timed mock exams and a wrong book that follows you between the web and the app.

Start studying free

Equipment & Devices — Texas Journeyman Practice Questions

Worked questions

1. A maintenance disconnect is required to be within sight from equipment. What does within sight generally mean?

2. Equipment instructions specify a terminal torque. How should the connection be completed?

3. Indoor-rated equipment is proposed outdoors beneath a small awning. What must be verified?

4. Replacement equipment has adequate ampacity but an insufficient short-circuit rating. May it be installed?

5. A paddle fan is proposed on an outlet box that is listed only for luminaire support. What is required?

6. A permanently connected appliance requires servicing while energized parts could be exposed. What must the disconnecting means provide?

7. Equipment is 40 inches wide. What minimum working-space width generally applies in front of it?

8. May a single 20-ampere receptacle be installed on an individual 15-ampere branch circuit when its connected load is permitted?

9. What feature prevents a standby generator from backfeeding the normal utility source?

11 more in the bank

Other Texas Journeyman content areas