About NEC Article 100 Definitions Quiz
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- This quiz through repetition by design helps you learn the definitions contained in Article 100. It contains only 10 questions generated from a bank of 121 questions. Quick and painless.
- Each time you take the quiz, questions are shuffled and 10 are picked randomly from the bank. The more often you take it the more questions you will be exposed to and the more you will learn the definitions within the National Electrical Code. And you will learn them.
- Pressing the submit button immediately returns your score along with the test questions and correct answer information for those questions you answered wrong. The test results are a very useful study tool.
| Trade Category: | Electrical |
| Test Category: | National Electrical Code |
| Test Subject: | Article 100 Definitions |
| Test Number: | 1 of 1 |
| Questions on Test: | 10 |
| From Bank of: | 121 Questions |
| Randomly Generated: | Yes |
| Test Time: |
#1. Which of the following terms refers to enclosures constructed so that dust will not enter under specified test conditions?
CORRECT ANSWER INFO:
Correct answer is D: Dusttight
NEC DEFINITION:
Dusttight: Enclosures constructed so that dust will not enter under specified test conditions.
Informational Note No. 1: Enclosure Types 3, 3S, 3SX, 4, 4X, 5, 6, 6P, 12, 12K, and 13, per ANSI/NEMA 250-2014, Enclosures for Electrical Equipment, are considered dusttight and suitable for use in unclassified locations and in Class II, Division 2, Class III; and Zone 22 hazardous (classified) locations.
Informational Note No. 2: For further information, see ANSI/ISA-12.12.01-2013, Nonincendive Electrical Equipment for Use in Class I and II, Division 2, and Class III, Divisions 1 and 2 Hazardous (Classified) Locations.
(Article 100 Definitions: Part I General)
#2. The NEC defines a continuous load as one where the maximum current is expected to continue for
CORRECT ANSWER INFO:
Correct answer is B: 3 hours or more.
NEC DEFINITION:
Continuous Load: A load where the maximum current is expected to continue for 3 hours or more.
(Article 100 Definitions: Part I General)
#3. Which of the following power systems could be considered part of a hybrid system?
CORRECT ANSWER INFO:
Correct answer is D: A and C
NEC DEFINITION:
Hybrid System: A system comprised of multiple power sources. These power sources could include photovoltaic, wind, micro-hydro generators, engine-driven generators, and others, but do not include electric power production and distribution network systems. Energy storage systems such as batteries, flywheels, or superconducting magnetic storage equipment do not constitute a power source for the purpose of this definition. The energy regenerated by an overwhelming (descending) elevator does not constitute a power source for the purpose of this definition.
(Article 100 Definitions: Part I General)
#4. What is an inverter intended for use in parallel with an electric utility to supply common loads and may deliver power to the utility?
CORRECT ANSWER INFO:
Correct answer is B: Interactive inverter
NEC DEFINITION:
Interactive Inverter: An inverter intended for use in parallel with an electric utility to supply common loads that may deliver power to the utility.
(Article 100 Definitions: Part I General)
NT COMMENTARY:
The answers for C (solar power inverter) and D (wind power inverter) are interactive inverters.
#5. A three-family dwelling is defined in the NEC as
CORRECT ANSWER INFO:
Correct answer is D: There is no definition for a three-family dwelling in the NEC.
NEC DEFINITION:
There is no definition for a three-family dwelling in the NEC.
NT NOTE:
For the sake of study convenience we list the NEC definitions for the different types of dwelling units:
Dwelling, One-Family: A building that consists solely of one dwelling unit.
Dwelling, Two-Family: A building that consists solely of two dwelling units.
Dwelling, Multifamily: A building that contains three or more dwelling units.
Dwelling Unit: A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
#6. What is an overcurrent device that generally consists of a control module that provides current-sensing, electronically derived time-current characteristics, energy to initiate tripping, and an interrupting module that interrupts current when an overcurrent occurs? (Such fuses may or may not operate in a current-limiting fashion, depending on the type of control selected.)
CORRECT ANSWER INFO:
Correct answer is A: Electronically Actuated Fuse
NEC DEFINITION:
Electronically Actuated Fuse: An overcurrent device that generally consists of a control module that provides current-sensing, electronically derived time-current characteristics, energy to initiate tripping, and an interrupting module that interrupts current when an overcurrent occurs. Such fuses may or may not operate in a current-limiting fashion, depending on the type of control selected.
(Article 100 Definitions: Part I General)
#7. Exposed (as applied to live parts) is defined as
CORRECT ANSWER INFO:
Correct answer is C: Capable of being inadvertently touched or approached nearer than a safe distance by a person.
NEC DEFINITION:
Exposed (as applied to live parts): Capable of being inadvertently touched or approached nearer than a safe distance by a person.
Informational Note: The term applies to parts that are not suitably guarded, isolated, or insulated.
(Article 100 Definitions: Part I General)
NT Note:
So there are two definitions of exposed in the NEC. The first is as applied to live parts and the second is as applied to wiring methods.
We list it here for your convenience:
Exposed (as applied to wiring methods): On or attached to the surface or behind panels designed to allow access.
(Article 100 Definitions: Part I General)
#8. What is a cutout box?
CORRECT ANSWER INFO:
Correct answer is D: An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure.
NEC DEFINITION:
Cutout Box: An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure.
(Article 100 Definitions: Part I General)
#9. Which term defines the electronic equipment that performs the telecommunications operations for the transmission of audio, video, and data, and includes power equipment, technical support equipment, and conductors dedicated solely to the operation of the equipment.
CORRECT ANSWER INFO:
Correct answer is D: Communications Equipment
NEC DEFINITION:
Communications Equipment: The electronic equipment that performs the telecommunications operations for the transmission of audio, video, and data, and includes power equipment (e.g., dc converters,inverters, and batteries), technical support equipment (e.g., computers), and conductors dedicated solely to the operation of the equipment.
Informational Note: As the telecommunications network transitions to a more data-centric network, computers, routers, servers, and their powering equipment, are becoming essential to the transmission of audio, video, and data and are finding increasing application in communications equipment installations.
(Article 100 Definitions: Part 1 General)
#10. What does the term “varying duty” mean?
CORRECT ANSWER INFO:
Correct answer is A: Equipment that may be operated at a wide range of loads and/or for wide periods of time.
NEC DEFINITION:
Duty, Varying: Operation at loads, and for intervals of time, both of which may be subject to wide variation.
(Article 100 Definitions: Part I General)
NT NOTE:
For the sake of study convenience we list the NEC definitions for types of duty as applied to the cycling of electrical loads:
Duty, Continuous: Operation at a substantially constant load for an indefinitely long time.
Duty, Intermittent: Operation for alternate intervals of (1), load and no load; or (2) load and rest; or (3) load, no load, and rest.
Duty, Periodic: Intermittent operation in which the load conditions are regularly recurrent.
Duty, Short-Time: Operation at a substantially constant load for a short and definite, specified time.
Duty, Varying: Operation at loads, and for intervals of time, both of which may be subject to wide variation.
For the new apprentice electrician and even experienced ones, all this can seem confusing but keep in mind the NEC is for all electricians in different capacities of work. An industrial electrician or one that is part of a facilities management team will understand these terms as they apply to their job more than say an electrician performing residential or commercial construction and service work.