Code lookup practice for an untabbed NEC
At the Minnesota exam you get DLI's soft-cover NEC with no tabs. You cannot flip to a tab, so you need the table of contents and the index. Here you name the article first, then the section, against the clock. Keep a 2026 NEC beside you and look each one up.
How to get fast in a book with no tabs
- Name the article before you touch the book. Most lookups start with knowing that GFCI is in Article 210 or that motors are in Article 430. The untabbed drill makes you commit to the article first.
- Use the table of contents for articles. It lists every chapter and article with its page. Learn roughly where each chapter sits so you open the book close to it.
- Use the index for a topic you cannot place. Look up the key word of the question, not the whole phrase, and follow it to a section number.
- Read the section number at the top of each page. Pages carry the article and section they hold, so you can page toward a number fast once you are in the right article.
- Time yourself. The exam gives you about 4 minutes a question across calculations and code. Lookups should take far less so the calculations get the time.
DLI's examination guide says the book is a soft-cover NEC with no tabs and that most questions are meant to be answered without the book. Source: DLI examination guide. More in the guide to studying with an untabbed code book.
102 lookup questions, 46 of them two-step. Article and section numbers were checked against published 2026 NEC tables of contents. We never print NEC text or tables.
Definitions, theory and plans 7
You need the NEC meaning of the terms "branch circuit" and "feeder". Where are the definitions used across the Code found?
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Article 100. Article 100 holds the definitions used in two or more articles, listed in alphabetical order. Look up the term there before you apply a rule that uses it. NEC Article 100
Which article gives the general requirements for all electrical installations, such as equipment approval, terminations and working space?
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Article 110. Article 110 covers general requirements that apply to every installation: approval and use of equipment, connections, markings and the spaces about equipment. NEC Article 110
Which article explains the purpose and scope of the NEC, how it is enforced and how its rules are worded?
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Article 90. Article 90 is the introduction to the Code. It covers purpose, scope, enforcement by the authority having jurisdiction and the difference between mandatory and explanatory text. NEC Article 90
For a voltage drop problem you need the DC resistance of a 10 AWG copper conductor. Which table gives conductor resistance, area and stranding?
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Chapter 9, Table 8. Chapter 9, Table 8 lists conductor properties: size, area in circular mils, stranding and DC resistance per 1000 ft. It is the usual table for voltage drop work. NEC Chapter 9 › Chapter 9, Table 8
Which table gives the AC resistance and reactance of 600-volt cables in conduit, used for more exact AC voltage drop work?
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Chapter 9, Table 9. Chapter 9, Table 9 lists AC resistance and reactance per 1000 ft for conductors in PVC, aluminum and steel conduit. Table 8 gives only DC resistance. NEC Chapter 9 › Chapter 9, Table 9
Where in the NEC book are the worked examples of dwelling and commercial load calculations?
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Informative Annex D. Informative Annex D contains worked calculation examples. They are not enforceable, but they show how the Article 120 methods are applied step by step. NEC Informative Annex D
In the 2026 NEC, where do you find the definition of "explosionproof equipment" used in the hazardous location articles?
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Article 100. Since the 2023 edition, definitions that used to sit in the first sections of individual articles were moved into Article 100. Look there first, even for hazardous location terms. NEC Article 100
Services and separately derived systems 13
Which article covers service conductors and service equipment, including the service disconnecting means?
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Article 230. Article 230 covers services: service drops and laterals, service-entrance conductors, service equipment and the service disconnecting means. Article 225 is for outside branch circuits and feeders. NEC Article 230
Which article contains the rules for system grounding, grounding electrodes and equipment bonding?
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Article 250. Article 250 covers grounding and bonding: system grounding, the grounding electrode system, grounding electrode conductors, bonding and equipment grounding conductors. NEC Article 250
Where do you find the required clearances for overhead service-drop conductors passing over a roof?
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230.24. Section 230.24 gives the clearances for overhead service conductors over roofs, above grade and from building openings. 230.26 is the point of attachment and 230.28 covers service masts. NEC Article 230 › 230.24
Which table do you use to size the grounding electrode conductor for an AC service?
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Table 250.66. Table 250.66 sizes the grounding electrode conductor from the size of the largest ungrounded service-entrance conductor or equivalent area of parallel sets. NEC Article 250 › Table 250.66
Which table is used to size the main bonding jumper at a service supplied by 3/0 AWG copper service-entrance conductors?
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Table 250.102(C)(1). Section 250.28 sends you to Table 250.102(C)(1) to size main and system bonding jumpers, based on the largest ungrounded conductor supplying the equipment. NEC Article 250 › Table 250.102(C)(1)
Which section lists the electrode types permitted for grounding, such as metal water pipe, concrete-encased electrodes, ground rings and rods?
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250.52. Section 250.52 lists the electrode types and their basic requirements. 250.50 requires bonding together the electrodes present, and 250.53 covers how rod, pipe and plate electrodes are installed. NEC Article 250 › 250.52
Which section covers the installation of rod, pipe and plate electrodes, including when a supplemental electrode is needed?
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250.53. Section 250.53 covers how grounding electrodes are installed, including burial of rods and the supplemental electrode for a single rod, pipe or plate. NEC Article 250 › 250.53
A 480 V to 208Y/120 V transformer supplies a panelboard. Which section covers grounding this separately derived system?
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250.30. Section 250.30 covers grounding of separately derived AC systems, such as the secondary of a transformer: system bonding jumper, grounding electrode conductor and electrode. NEC Article 250 › 250.30
Which section covers bonding of the metal water piping system inside a building?
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250.104. Section 250.104 covers bonding of metal piping systems and exposed structural metal, including interior metal water piping. NEC Article 250 › 250.104
Which section covers grounding of an AC system supplied by a service, including where the grounding electrode conductor connects?
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250.24. Section 250.24 covers grounding of service-supplied AC systems: the grounding electrode conductor connection, the main bonding jumper and bringing the grounded conductor to the service. NEC Article 250 › 250.24
A detached garage is supplied by a feeder from the house. Which section covers the grounding electrode at the garage?
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250.32. Section 250.32 covers buildings or structures supplied by a feeder or branch circuit, including the grounding electrode at the second building and keeping the neutral separate from the equipment grounding conductor. NEC Article 250 › 250.32
Which section requires ground-fault protection of equipment on certain large solidly grounded wye services?
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230.95. Section 230.95 covers ground-fault protection of equipment (GFPE) for service disconnects. 230.71 limits the number of disconnects and 230.79 sets minimum disconnect ratings. NEC Article 230 › 230.95
A service mast will support the service drop. Which section covers service masts used as supports?
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230.28. Section 230.28 covers service masts used to support service drops: strength, guying and what may be attached to them. 230.54 covers weatherheads and drip loops. NEC Article 230 › 230.28
Feeders 6
Which article covers the minimum rating, sizing and overcurrent protection of feeder conductors?
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Article 215. Article 215 covers feeders: minimum ampacity and size, overcurrent protection and identification. Article 210 is for branch circuits and Article 225 for outside feeders. NEC Article 215
In the 2026 NEC, which article contains the branch-circuit, feeder and service load calculation methods?
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Article 120. For 2026, load calculations moved from Article 220 to Article 120 in Chapter 1. Most section endings stayed the same, so 220.41 is now 120.41, for example. NEC Article 120
A feeder runs overhead from a house to a detached workshop on the same property. Which article covers this outside feeder?
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Article 225. Article 225 covers outside branch circuits and feeders run on or between buildings, structures or poles on the premises, including clearances and the disconnect at each building. NEC Article 225
Which section requires a disconnecting means for a building supplied by a feeder from another building?
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225.31. Section 225.31 requires a disconnecting means for all ungrounded conductors that supply or pass through a building or structure fed by an outside feeder or branch circuit. NEC Article 225 › 225.31
Which table gives the demand factors applied to the general lighting load in a dwelling feeder or service calculation?
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Table 120.45. Table 120.45 holds the lighting load demand factors (for dwellings, the first 3000 VA at 100% and the next block at 35%). Tables 120.54 and 120.55 are for dryers and ranges. NEC Article 120 › Table 120.45
Which table gives the demand loads for household electric ranges, wall-mounted ovens and counter-mounted cooking units?
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Table 120.55. Table 120.55 (formerly Table 220.55) gives demand loads for household cooking appliances, with notes for ranges over 12 kW and for separate ovens and cooktops. NEC Article 120 › Table 120.55
Branch circuits and conductors 15
Which section lists the dwelling unit locations where 125-volt through 250-volt receptacles need GFCI protection?
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210.8(A). Section 210.8(A) lists the dwelling locations that need ground-fault circuit-interrupter (GFCI) protection, such as bathrooms, kitchens, garages and outdoors. 210.8(B) covers other than dwelling units. NEC Article 210 › 210.8(A)
A restaurant kitchen and a commercial rooftop both have receptacles. Which section sets GFCI requirements for these locations other than dwelling units?
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210.8(B). Section 210.8(B) lists the GFCI locations for other than dwelling units, such as commercial kitchens, rooftops and outdoor areas. 210.8(A) is only for dwellings. NEC Article 210 › 210.8(B)
Which section covers arc-fault circuit-interrupter (AFCI) protection for branch circuits in dwelling bedrooms and living areas?
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210.12. Section 210.12 covers AFCI protection: where it is required in dwellings and dormitories and the permitted ways to provide it. GFCI rules are in 210.8. NEC Article 210 › 210.12
Which section requires the dwelling small-appliance, laundry and bathroom branch circuits?
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210.11(C). Section 210.11(C) requires the dwelling branch circuits for small appliances, laundry and bathrooms (and garages). 210.52(B) tells where the small-appliance receptacles go. NEC Article 210 › 210.11(C)
Which section requires receptacle outlets along the walls of dwelling living rooms and bedrooms, spaced by distance along the floor line?
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210.52(A). Section 210.52(A) covers general receptacle spacing in dwelling rooms such as living rooms, bedrooms and dining rooms, including what counts as wall space. NEC Article 210 › 210.52(A)
Which section covers receptacle outlets that serve dwelling kitchen countertops and work surfaces?
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210.52(C). Section 210.52(C) covers countertop and work surface receptacles in dwelling kitchens and similar areas. 210.52(D) is bathrooms. NEC Article 210 › 210.52(C)
Which table shows the receptacle ratings permitted on a branch circuit of a given rating, such as 15 A or 20 A receptacles on a 20 A circuit?
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Table 210.21(B)(3). Table 210.21(B)(3) matches receptacle ratings to circuit ratings. Table 210.21(B)(2) is the maximum cord-and-plug load on a receptacle, and Table 210.24 is the branch-circuit summary. NEC Article 210 › Table 210.21(B)(3)
Which table summarizes branch-circuit requirements (minimum conductor size, OCPD rating, outlet devices and maximum load) for 15 A through 50 A circuits?
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Table 210.24. Table 210.24 is a one-page summary of the requirements for 15, 20, 30, 40 and 50 A branch circuits that serve two or more outlets. NEC Article 210 › Table 210.24
Which table gives allowable ampacities of insulated conductors rated up to 2000 V, with not more than three current-carrying conductors in raceway, cable or earth, based on 30 °C ambient?
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Table 310.16. Table 310.16 is the main ampacity table for conductors in raceway, cable or directly buried, based on a 30 °C ambient and no more than three current-carrying conductors. Table 310.17 is for free air. NEC Article 310 › Table 310.16
Conductors will run through a space where the ambient temperature is 45 °C. Which table gives the correction factor for the Table 310.16 ampacity?
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Table 310.15(B)(1)(1). Table 310.15(B)(1)(1) gives ambient temperature correction factors for ampacity tables based on 30 °C. Table 310.15(C)(1) is for the number of current-carrying conductors. NEC Article 310 › Table 310.15(B)(1)(1)
Six current-carrying conductors share one raceway. Which table gives the adjustment factor for their ampacity?
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Table 310.15(C)(1). Table 310.15(C)(1) gives adjustment factors for more than three current-carrying conductors in a raceway or cable. Chapter 9, Table 1 is about conduit fill, not ampacity. NEC Article 310 › Table 310.15(C)(1)
Which table gives the allowable ampacities of single insulated conductors in free air, based on 30 °C ambient?
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Table 310.17. Table 310.17 covers single insulated conductors in free air. Its values are higher than Table 310.16 because heat leaves a conductor in free air more easily. NEC Article 310 › Table 310.17
Which section limits the overcurrent protection of 14, 12 and 10 AWG copper conductors to 15, 20 and 30 A?
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240.4(D). Section 240.4(D) sets the small-conductor limits, so the OCPD for 12 AWG copper, for example, may not exceed 20 A even though the table ampacity is higher. 240.4(B) is the next-size-up rule. NEC Article 240 › 240.4(D)
Which article covers the use and identification of grounded conductors?
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Article 200. Article 200 covers grounded conductors: how they are identified, how their terminals are marked and when white or gray insulation may be used for other purposes. NEC Article 200
Which section covers multiwire branch circuits, including the rule for disconnecting all ungrounded conductors at the same time?
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210.4. Section 210.4 covers multiwire branch circuits: simultaneous disconnecting of the ungrounded conductors, line-to-neutral loads and grouping of the conductors in the panel. NEC Article 210 › 210.4
Wiring methods and materials 14
Which article covers nonmetallic-sheathed cable (Type NM), the usual cable in house wiring?
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Article 334. Article 334 covers Type NM cable: uses permitted and not permitted, support, bending and ampacity. Article 330 is MC cable and Article 340 is UF cable. NEC Article 334
Which article covers electrical metallic tubing (EMT)?
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Article 358. Article 358 covers EMT. Article 342 is IMC, Article 344 is rigid metal conduit and Article 362 is electrical nonmetallic tubing. NEC Article 358
Which article covers metal-clad cable (Type MC)?
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Article 330. Article 330 covers Type MC cable. Article 320 is armored cable (Type AC), which has a different construction and its own article. NEC Article 330
Which article covers rigid polyvinyl chloride conduit (PVC)?
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Article 352. Article 352 covers rigid PVC conduit, including expansion fittings and support spacing. Article 356 is liquidtight flexible nonmetallic conduit. NEC Article 352
A motor connection uses liquidtight flexible metal conduit. Which article covers this raceway?
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Article 350. Article 350 covers liquidtight flexible metal conduit (LFMC). Article 348 is plain flexible metal conduit and Article 356 is the nonmetallic liquidtight type. NEC Article 350
Which article covers underground feeder and branch-circuit cable (Type UF)?
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Article 340. Article 340 covers Type UF cable, which may be directly buried. Article 338 covers service-entrance cable (SE and USE). NEC Article 340
Which article covers service-entrance cable, Types SE and USE?
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Article 338. Article 338 covers SE and USE cable, used for services and in some cases for feeders and branch circuits. Article 336 is power and control tray cable (Type TC). NEC Article 338
For a conduit fill problem, which table gives the internal area and the 40% fill area of each trade size of EMT?
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Chapter 9, Table 4. Chapter 9, Table 4 gives dimensions and percent areas for each conduit and tubing type and trade size. Table 5 gives conductor areas and Table 1 gives the fill percentages. NEC Chapter 9 › Chapter 9, Table 4
Which table sets the maximum percent of a conduit cross section that conductors may fill, based on the number of conductors?
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Chapter 9, Table 1. Chapter 9, Table 1 gives the fill limits by number of conductors. Its notes also cover nipples, equipment grounding conductors and when to use Informative Annex C. NEC Chapter 9 › Chapter 9, Table 1
Where do you find ready-made tables of the maximum number of same-size conductors permitted in each trade size of conduit or tubing?
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Informative Annex C. Informative Annex C has conduit and tubing fill tables for conductors of the same size, organized by raceway type. Annex D has load calculation examples. NEC Informative Annex C
Which article covers outlet boxes, device boxes, pull boxes, conduit bodies and handhole enclosures?
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Article 314. Article 314 covers boxes, conduit bodies and handhole enclosures, including box fill, pull box sizing and support. Article 312 covers cabinets and meter socket enclosures. NEC Article 314
Which article covers cable tray systems used to support cables and raceways?
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Article 392. Article 392 covers cable trays: the wiring methods allowed in them, installation, fill and grounding. Article 376 is metal wireways and Article 386 is surface metal raceways. NEC Article 392
Which article gives the general requirements that apply to all wiring methods, such as protection from physical damage and underground installations?
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Article 300. Article 300 covers general requirements for wiring methods and materials, including burial depth, protection against damage, and securing and support. NEC Article 300
Which article covers conductors for general wiring, including insulation types, markings and ampacity tables?
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Article 310. Article 310 covers conductors for general wiring: insulation types and uses, markings, minimum sizes, parallel conductors and the ampacity tables. Flexible cords are in Article 400. NEC Article 310
Equipment and devices 13
Which article covers switches and circuit breakers used as switches, including switch enclosures in wet locations and the maximum height of the operating handle?
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Article 404. Article 404 covers switches: enclosures, accessibility and grouping, maximum handle height and bonding. In 2026, general-use snap switches and dimmers moved to Part III of Article 406. NEC Article 404
Which article covers receptacles, cord connectors and attachment plugs, including tamper-resistant and weather-resistant receptacles?
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Article 406. Article 406 (titled "Wiring Devices" in 2026) covers receptacles, cord connectors and attachment plugs, including tamper-resistant, weather-resistant and replacement rules. NEC Article 406
Which article covers switchboards and panelboards, including the circuit directory and panelboard overcurrent protection?
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Article 408. Article 408 covers switchboards and panelboards: circuit identification, phase arrangement, overcurrent protection of panelboards and clearances. NEC Article 408
Which article covers luminaires, lampholders and lamps, including luminaires in closets and near bathtubs?
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Article 410. Article 410 covers luminaires, lampholders and lamps: locations, supports, wiring and special rules such as clothes closets and bathtub zones. Article 411 is low-voltage lighting systems. NEC Article 410
A dishwasher, a water heater and a trash compactor are being installed. Which article covers these appliances?
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Article 422. Article 422 covers appliances in any occupancy: branch-circuit sizing, disconnecting means and cord connections for items such as water heaters, dishwashers and disposers. NEC Article 422
Which article covers fixed electric space-heating equipment, such as electric baseboard heaters?
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Article 424. Article 424 covers fixed electric space-heating equipment, including baseboard heaters, duct heaters and radiant heating cables. NEC Article 424
Which article covers the installation of transformers, including their overcurrent protection and ventilation?
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Article 450. Article 450 covers transformers and transformer vaults: overcurrent protection, location, ventilation and grounding. Article 445 is generators. NEC Article 450
Which table gives the maximum overcurrent protection for transformers rated 1000 volts and less, as a percent of rated current?
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Table 450.5(B). In the 2026 NEC, transformer overcurrent protection moved from 450.3 to 450.5. Table 450.5(B) (Table 450.3(B) in 2023) gives the maximum primary and secondary OCPD ratings, as a percent of rated current, for transformers of 1000 V and less. NEC Article 450 › Table 450.5(B)
A bank of stationary batteries is being installed for a UPS. Which article covers stationary batteries?
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Article 480. Article 480 (Stationary Batteries) covers battery installations, terminations and ventilation. Article 706 covers energy storage systems as complete systems. NEC Article 480
Which article covers listed low-voltage lighting systems operating at 30 volts or less, such as landscape lighting?
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Article 411. Article 411 covers low-voltage lighting systems and their power supplies, such as listed landscape and track systems. Article 410 is general luminaire rules. NEC Article 411
Which article covers flexible cords and flexible cables, including where they may and may not be used?
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Article 400. Article 400 covers flexible cords and cables: types, ampacity, uses permitted and uses not permitted. Conductors for general wiring are in Article 310. NEC Article 400
Which section covers the working space and access required around electrical equipment rated 1000 V or less?
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110.26. Section 110.26 covers spaces about electrical equipment: depth, width and height of working space, entrance, illumination and dedicated equipment space. NEC Article 110 › 110.26
Which section requires arc-flash hazard marking on service and feeder equipment in other than dwelling units?
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110.16. Section 110.16 covers arc-flash hazard marking. In 2026 the label must show items such as nominal voltage, arc-flash boundary and the date of the assessment. 110.22 is identification of disconnects. NEC Article 110 › 110.16
Motors and generators 10
Which article covers motors, motor branch circuits, motor overload protection and motor controllers?
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Article 430. Article 430 covers motor circuits, controllers and adjustable-speed drives: conductor sizing, overloads, short-circuit protection, controllers and disconnects. NEC Article 430
A rooftop unit has a hermetic refrigerant motor-compressor. Which article has the special rules for this equipment?
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Article 440. Article 440 covers air-conditioning and refrigeration equipment with hermetic refrigerant motor-compressors. It adds to or changes the Article 430 rules for that equipment. NEC Article 440
Which article covers the installation of generators, including conductor sizing and disconnecting means?
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Article 445. Article 445 covers generators: overcurrent protection, conductor ampacity from the terminals and the disconnecting means. Article 702 covers optional standby systems as a whole. NEC Article 445
You need the full-load current of a 10 hp, 460-volt, three-phase induction motor. Which table do you use?
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Table 430.250. Table 430.250 gives full-load currents for three-phase AC motors. Table 430.248 is single-phase and Table 430.247 is DC motors. NEC Article 430 › Table 430.250
Which table gives the full-load current of single-phase AC motors, such as a 2 hp, 230-volt motor?
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Table 430.248. Table 430.248 lists full-load currents of single-phase AC motors by horsepower and voltage. Use these values, not the nameplate, to size conductors and short-circuit protection. NEC Article 430 › Table 430.248
Which section sets the maximum rating of the motor branch-circuit short-circuit and ground-fault protective device?
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430.52. Section 430.52 and its table set the maximum fuse or breaker rating, as a percent of motor full-load current, for motor branch-circuit short-circuit and ground-fault protection. 430.32 is overloads. NEC Article 430 › 430.52
Which section covers overload protection for continuous-duty motors?
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430.32. Section 430.32 covers overload protection of continuous-duty motors, sized from the nameplate current. Short-circuit and ground-fault protection is a separate item in 430.52. NEC Article 430 › 430.32
Which section covers sizing the branch-circuit conductors that supply a single motor?
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430.22. Section 430.22 covers conductors for a single motor. 430.24 covers conductors that supply several motors, and 430.52 covers the short-circuit protective device. NEC Article 430 › 430.22
A feeder supplies three motors and no other load. Which section covers the minimum ampacity of the feeder conductors?
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430.24. Section 430.24 covers conductors supplying several motors, or motors and other loads. The feeder overcurrent device for motors is in 430.62. NEC Article 430 › 430.24
A 5 hp, 240-volt DC motor drives a hoist. Which table gives its full-load current?
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Table 430.247. Table 430.247 gives full-load currents for direct-current motors. Tables 430.248 and 430.250 are for single-phase and three-phase AC motors. NEC Article 430 › Table 430.247
Controls and disconnecting means 4
Which section explains what the NEC means by "in sight from" or "within sight" when locating a disconnect?
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110.29. Section 110.29 defines in sight from (within sight) as visible and not more than 50 ft away. Disconnect rules in Articles 430 and 440 rely on it. NEC Article 110 › 110.29
Which section requires a disconnecting means in sight from a motor controller and from the motor location?
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430.102. Section 430.102 covers the location of motor disconnects: in sight from the controller, and in sight from the motor unless a permitted alternative applies. 430.109 covers the type of disconnect. NEC Article 430 › 430.102
In the 2026 NEC, which new article covers non-power-limited remote-control and signaling circuits?
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Article 206. Article 206 is new in 2026 and covers non-power-limited remote-control and signaling circuits in Chapter 2. Article 724 covers Class 1 power-limited circuits and Article 725 covers Class 2. NEC Article 206
A thermostat circuit is supplied by a listed Class 2 transformer. Which article covers Class 2 power-limited circuits?
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Article 725. Article 725 covers Class 2 power-limited circuits. Article 726 covers Class 4 fault-managed power systems and Article 206 covers non-power-limited control circuits. NEC Article 725
Special occupancies and equipment 14
Which article covers the wiring and bonding of swimming pools, spas, hot tubs and fountains?
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Article 680. Article 680 covers pools, spas, hot tubs, fountains and hydromassage bathtubs. Article 682 is natural and artificially made bodies of water, and Article 555 is marinas and docks. NEC Article 680
A customer is adding an outdoor hot tub. Which part of Article 680 covers permanently installed and self-contained spas and hot tubs?
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Article 680, Part IV. Article 680, Part IV covers spas and hot tubs, including outdoor and indoor installations and GFCI protection. Part II is permanently installed pools, Part III storable pools and Part V fountains. NEC Article 680 › Article 680, Part IV
Which article covers electrical installations at marinas, boatyards and docking facilities?
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Article 555. Article 555 covers marinas, boatyards and commercial and noncommercial docking facilities, including shore power receptacles and ground-fault protection on docks. NEC Article 555
Which article covers the wiring of hospitals, nursing homes and other health care facilities?
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Article 517. Article 517 covers health care facilities: wiring and protection in patient care spaces, the essential electrical system and related rules. NEC Article 517
A church fellowship hall is designed to hold 200 people. Which article covers this type of assembly occupancy?
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Article 518. Article 518 covers assembly occupancies for gatherings of 100 or more persons, such as halls, auditoriums and places of worship, including the wiring methods permitted. NEC Article 518
Which article covers temporary power and lighting for construction, remodeling and holiday lighting?
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Article 590. Article 590 covers temporary installations: time limits, wiring methods and GFCI protection for personnel on construction sites. Article 525 is carnivals and fairs. NEC Article 590
A dairy barn and a poultry house are being wired. Which article covers agricultural buildings?
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Article 547. Article 547 covers agricultural buildings with dust, moisture or corrosive conditions, such as livestock barns, including wiring methods and equipotential planes. NEC Article 547
Which article covers the electrical requirements for mobile homes, manufactured homes and mobile home parks?
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Article 550. Article 550 covers mobile homes, manufactured homes and mobile home parks, including the service equipment and feeder to the home. Article 551 is recreational vehicles. NEC Article 550
An RV park is adding new site supply equipment with 50 A receptacles. Which article covers recreational vehicles and RV parks?
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Article 551. Article 551 covers recreational vehicles and recreational vehicle parks, including site supply equipment and its receptacles. NEC Article 551
Which article covers gasoline stations and other motor fuel dispensing facilities, including the classified areas around dispensers?
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Article 514. Article 514 covers motor fuel dispensing facilities, with a table that sets the classified areas around dispensers and tanks. Article 511 is commercial garages. NEC Article 514
Which article gives the general rules for hazardous (classified) locations, including how Class I, II and III locations are defined?
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Article 500. Article 500 is the general article for hazardous (classified) locations under the class and division system. Articles 501 and 502 give the wiring rules for Class I and Class II. NEC Article 500
Exit lighting in a building must stay on when utility power fails, as required by the building code. Which article covers these emergency systems?
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Article 700. Article 700 covers emergency systems required by law for life safety, such as egress and exit lighting. Article 701 is legally required standby and Article 702 is optional standby. NEC Article 700
Which article covers electric signs, including the required sign outlet at commercial occupancies?
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Article 600. Article 600 covers electric signs: the sign branch circuit, disconnecting means, grounding and bonding. Article 410 covers general luminaires. NEC Article 600
A server room has a raised floor and a disconnect for the computer equipment at the exit door. Which article covers information technology equipment rooms?
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Article 645. Article 645 covers information technology equipment (ITE) rooms, including wiring under raised floors and the remote disconnecting means. NEC Article 645
Renewable energy and EV charging 6
Which article covers rooftop solar photovoltaic (PV) systems on homes and businesses?
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Article 690. Article 690 covers solar PV systems: circuit sizing, disconnects, rapid shutdown, wiring methods and grounding. Article 691 is for large-scale PV electric supply stations. NEC Article 690
A home battery system stores energy from solar panels. Which article covers energy storage systems?
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Article 706. Article 706 covers energy storage systems (ESS), including disconnects, circuit sizing and commissioning. Article 480 covers stationary batteries as equipment. NEC Article 706
A PV inverter will connect to a panelboard that is also supplied by the utility. Which article covers interconnecting power sources with the utility?
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Article 705. Article 705 covers interconnected electric power production sources that operate in parallel with another source, including supply-side and load-side connections. NEC Article 705
A homeowner wants a 48 A Level 2 charger for an electric car in the garage. Which article covers this electric vehicle equipment?
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Article 625. Article 625 covers electric vehicle power transfer systems, including EVSE branch circuits, disconnects and GFCI protection. Article 624 is for self-propelled vehicles such as forklifts and golf carts. NEC Article 625
A warehouse is installing charging stations for electric forklifts. In the 2026 NEC, which new article covers power transfer to this type of self-propelled vehicle?
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Article 624. Article 624 is new in 2026 and covers electric self-propelled vehicle power transfer systems for equipment such as forklifts, golf carts and similar vehicles. Road EVs stay in Article 625. NEC Article 624
Which section requires PV systems on buildings to have a rapid shutdown function to reduce shock hazard for firefighters?
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690.12. Section 690.12 covers PV rapid shutdown on buildings. 690.7 is maximum voltage, 690.8 is circuit sizing and current, and 690.13 is the PV system disconnecting means. NEC Article 690 › 690.12