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Questions and Answers
How many first-level subdivisions exist in Section 250.122?
How many first-level subdivisions exist in Section 250.122?
7
A conductor with continuous white or gray covering shall be used only for the grounded circuit conductor.
A conductor with continuous white or gray covering shall be used only for the grounded circuit conductor.
True
A supplementary grounding electrode is required when the only grounding electrode available is?
A supplementary grounding electrode is required when the only grounding electrode available is?
a metal underground water pipe
Match the article title with the appropriate NEC article.
Match the article title with the appropriate NEC article.
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Which list items does Exception No. 1 in Section 210.8(B) apply to?
Which list items does Exception No. 1 in Section 210.8(B) apply to?
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The broad scope of Chapter 2, Wiring and Protection, is addressed by subdividing this chapter into how many articles?
The broad scope of Chapter 2, Wiring and Protection, is addressed by subdividing this chapter into how many articles?
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The definition of tap conductors is located in which section?
The definition of tap conductors is located in which section?
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What is defined as the circuit conductors between the final overcurrent device and the outlet(s)?
What is defined as the circuit conductors between the final overcurrent device and the outlet(s)?
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What is defined as an area including a sink with plumbing fixtures?
What is defined as an area including a sink with plumbing fixtures?
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An 8 AWG gray insulated neutral conductor is acceptable to supply a 120-volt electrical heater.
An 8 AWG gray insulated neutral conductor is acceptable to supply a 120-volt electrical heater.
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General-purpose branch circuits rated at 30 amperes are acceptable for lighting and receptacle circuits in dwelling units.
General-purpose branch circuits rated at 30 amperes are acceptable for lighting and receptacle circuits in dwelling units.
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One common neutral conductor is acceptable with two sets of 120/208-volt feeders.
One common neutral conductor is acceptable with two sets of 120/208-volt feeders.
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In a strip mall, service conductors for Building No. 2 can pass through Building No. 1.
In a strip mall, service conductors for Building No. 2 can pass through Building No. 1.
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What is the minimum overhead clearance for branch-circuit conductors crossing a sidewalk?
What is the minimum overhead clearance for branch-circuit conductors crossing a sidewalk?
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What is the maximum nominal voltage permitted for a luminaire installed in a motel room?
What is the maximum nominal voltage permitted for a luminaire installed in a motel room?
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The required branch-circuit overcurrent protection rating for a continuous load of 80 amperes is 100 amperes.
The required branch-circuit overcurrent protection rating for a continuous load of 80 amperes is 100 amperes.
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What is the minimum calculated feeder load for 12 feet of show window lighting?
What is the minimum calculated feeder load for 12 feet of show window lighting?
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What should circuit breakers used for switching fluorescent lighting circuits be marked?
What should circuit breakers used for switching fluorescent lighting circuits be marked?
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What is the feeder load for each small-appliance branch circuit required in a dwelling unit?
What is the feeder load for each small-appliance branch circuit required in a dwelling unit?
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How far shall service-entrance cables be supported from the service head?
How far shall service-entrance cables be supported from the service head?
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What is the minimum length for a rod-type grounding electrode?
What is the minimum length for a rod-type grounding electrode?
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What is the minimum vertical clearance for overhead service drop conductors from roofs?
What is the minimum vertical clearance for overhead service drop conductors from roofs?
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Surge-protective devices (SPDs) must be installed indoors and accessible to unqualified persons.
Surge-protective devices (SPDs) must be installed indoors and accessible to unqualified persons.
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The NEC requires a conductor to have overcurrent protection at the point it receives its supply.
The NEC requires a conductor to have overcurrent protection at the point it receives its supply.
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Where shall Type 2 SPDs be connected in relation to a service disconnect overcurrent device?
Where shall Type 2 SPDs be connected in relation to a service disconnect overcurrent device?
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Study Notes
NEC Chapter 2: Planning the Installation
- Section 250.122 contains 7 first-level subdivisions.
- Continuous white or gray covering on conductors is reserved for the grounded circuit conductor (200.7).
- A supplementary grounding electrode is mandatory when the only available one is a metal underground water pipe (250.53).
- Articles associated with various topics:
- Branch Circuits → Article 210
- Branch-Circuit, Feeder, and Service Load Calculations → Article 220
- Feeders → Article 215
- Overvoltage Protection → Article 242
- Outside Branch Circuits and Feeders → Article 225
- Grounding and Bonding → Article 250
- Use and Identification of Grounded Conductors → Article 200
- Services → Article 230
- Overcurrent Protection → Article 240
- Exception No. 1 in subdivision 210.8(B) applies only to list items (3) and (4).
- Chapter 2, Wiring and Protection, includes a total of 9 articles.
- Article 240 details the general location provisions for overcurrent protective devices and defines tap conductors in Section 240.2.
- A branch circuit refers to conductors between the final overcurrent device and the outlet(s) (100).
- A bathroom is defined as an area with a sink and one or more plumbing fixtures, such as a toilet or a shower (100).
- An 8 AWG gray insulated neutral conductor is allowed for a 120-volt heater (200.6(A)).
- Installing general-purpose branch circuits rated at 30 amperes for lighting and receptacles in dwelling units is a violation (210.23(B)).
- A common neutral conductor with two sets of 120/208-volt, 3-phase, 4-wire feeders is acceptable (215.4(A)).
- Service conductors passing through the interior ceiling space of adjacent buildings is a violation (230.3).
- Overhead branch-circuit conductors must maintain a minimum clearance of 10 feet when crossing sidewalks (225.18(1)).
- The maximum nominal voltage for luminaires in motel rooms is limited to 120V (210.6(A)(1)).
- Continuous loads of 80 amperes require branch-circuit overcurrent protection rated at 100 amperes (210.20(A)).
- For 12 feet of show window lighting, the minimum calculated feeder load is 2,400 VA (220.43(A)).
- Circuit breakers for fluorescent lighting circuits must be marked as HID or SWD (240.83(D)).
- The feeder load for each small-appliance branch circuit in a dwelling unit is calculated at 1,500 VA (220.52(A)).
- Service-entrance cables must be supported within 12 inches of the service head (230.51(A)).
- A rod-type grounding electrode must be at least 8 feet long (250.52(A)(5)).
- Overhead service drop conductors require a vertical clearance of at least 8 feet from roofs (230.24(A)).
- Surge-protective devices (SPDs) can be installed indoors or outdoors and should be accessible unless listed otherwise (242.22).
- NEC mandates that conductors have overcurrent protection where they receive their supply (240.21).
- Type 2 SPDs must be connected on the load side of the service disconnect overcurrent device as outlined in Section 230.91 (242.14(A)).
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Test your knowledge on the National Electrical Code (NEC) Chapter 2 with these flashcards. Each card covers key concepts related to planning the installation according to NEC standards, including important definitions and requirements. Perfect for electrical professionals preparing for installation tasks.
