North Carolina Limited Electrical Contractor (L)

Key Concepts

Grounded Conductor Identification (Article 200) - Conductors 6 AWG or smaller must be identified as grounded (neutral) by: continuous white outer finish, continuous gray outer finish, or three continuous white or gray stripes (200.6(A)) - Conductors 4 AWG or larger may alternatively be identified at termination only with a distinctive white or gray marking that encircles the conductor (200.6(B)(4)) - White or gray insulation is reserved exclusively for grounded conductors — it cannot be used for ungrounded conductors unless specifically permitted (200.7(A)) - Flexible cord grounded conductors: identified by white or gray finish per 200.6(C)

Key Concepts

Article 240 governs overcurrent protection for circuits not more than 1000 volts (Parts I–VII). Part IX covers over 1000 volts.

Purpose: OCPDs open the circuit when current reaches a value that causes excessive or dangerous temperature in conductors or insulation (see Informational Note, 240.1).

Protection of Conductors (240.4): Conductors must be protected at their ampacity per 310.14, with specific exceptions in 240.4(A)–(G). Flexible cords, flexible cables, and fixture wires are excluded from this general rule.

Location in Circuit: The OCPD must be placed on the load side of, or as an integral part of, the service disconnect (230.208). It must protect all ungrounded conductors it supplies and must be capable of interrupting all fault current values at its location.

Key Concepts

Article 300 — General Requirements for Wiring Methods

• Scope (300.1): Article 300 applies to all wiring installations unless modified by another Chapter 3 article. It does not apply to conductors that are integral parts of equipment (motors, controllers, factory-assembled equipment).
• Voltage limit (300.2(A)): Chapter 3 wiring methods apply to systems 1000V or less unless specifically permitted for higher voltages elsewhere in the Code.
• Single conductors (300.3(A)): Single conductors from Table 310.4(A) may only be installed as part of a recognized wiring method. Exception: individual conductors installed as separate overhead conductors per 225.6.
• All conductors of the same circuit (300.3(B)): All circuit conductors — including grounded, equipment grounding, and bonding conductors — **must be in the same raceway, cable, trench, or…

8 questions | 8% of exam | NEC 2020 Articles 312 & 314

Key Concepts

Article 312 – Cabinets, Cutout Boxes, and Meter Socket Enclosures

• 312.2 – Damp/Wet Locations: Surface-type enclosures in damp/wet locations must prevent moisture accumulation and be mounted with at least 6 mm (¼ in.) airspace between the enclosure and wall. Wet location enclosures must be weatherproof. Exception: Nonmetallic enclosures may be installed without airspace on concrete, masonry, tile, or similar surfaces.

• 312.3 – Position in Wall: In noncombustible walls (concrete, tile), the cabinet front edge must not be set back more than 6 mm (¼ in.) from the finished surface. In combustible walls (wood), cabinets must be flush with or project from the finished surface — no setback permitted.…

11 questions | 11% of exam | NEC 2020

Key Concepts

Service Entrance Conductors (NEC Article 230) Article 230 governs all service conductor installations. Key rules:

• 230.6 — Conductors considered outside a building when encased in 2" of concrete, buried under 18" of earth, or installed in conduit within a building.
• 230.9 — Service conductors must maintain 3 ft clearance from windows, doors, porches, and similar openings.
• 230.24 — Overhead service-drop clearances: 10 ft above finished grade (for areas accessible to pedestrians only), 12 ft over residential driveways, 18 ft over public streets/parking areas.
• 230.28 — Only one service mast is permitted per service, and it must be supported adequately to withstand strain.
• 230.42 — Service entrance conductor size must…

Key Concepts

Article 430 governs motors, motor circuits, and controllers. This is the primary reference for nearly every motor question on the exam.

Branch Circuit Ampacity (430.22): Single motor conductors must have an ampacity of not less than 125% of the motor's full-load current (FLC) as listed in Tables 430.247–430.250 — not the nameplate current.

Feeder Ampacity (430.24): Feeders supplying multiple motors must have an ampacity of 125% of the largest motor's FLC + sum of all other motors' FLC at the same time.

Overload Protection (430.32): Overload devices protect the motor windings from sustained overcurrent. For motors with a service factor of 1.15 or greater, or a temperature rise of 40°C or less, the overload device must not exceed 125% of the motor's full-load current.…

NC Limited Electrical Contractor (L) Exam

Key Concepts

Mobile Homes & Mobile Home Parks (Article 550)

Definitions to know: - Mobile Home: Factory-assembled, built on permanent chassis, designed as dwelling without permanent foundation - Manufactured Home: 8 ft+ wide OR 40 ft+ long in travel mode, OR 320 ft² or more on site; built on permanent chassis — includes plumbing, heating, A/C, and electrical - For Code purposes: "mobile home" includes manufactured homes

Power Supply (550.10): - Supply must be a feeder assembly with not more than one listed 50-ampere mobile home power-supply cord or a permanently installed feeder - Cord is a 4-conductor type; grounding conductor = continuous green or green with yellow stripes - Attachment plug cap: **3-pole, 4-wire grounding type,…

Key Concepts

Branch Circuits (Article 210) - Branch-circuit voltage in dwelling units shall not exceed 120V between conductors for luminaires and cord-and-plug loads ≤1440 VA or less than ¼ hp (210.6(A)). - Circuits not exceeding 277V to ground may supply listed electric-discharge, LED luminaires, and permanently connected utilization equipment (210.6(C)). - Multiwire branch circuits must have all ungrounded conductors originate from the same panelboard and must have a simultaneous disconnect for all ungrounded conductors at the origin (210.4(A) and (B)). - Multiwire branch circuits shall supply line-to-neutral loads only, unless an exception applies (one piece of utilization equipment, or all ungrounded conductors opened simultaneously) (210.4(C)).

Key Concepts

Luminaires (Article 410)

• 410.6: All luminaires, lampholders, and retrofit kits must be listed. No exceptions.
• 410.7: Luminaires, lampholders, and retrofit kits cannot be reconditioned. A retrofit kit installed per manufacturer instructions does not make the luminaire "reconditioned."
• 410.5: No live parts normally exposed to contact. Exception: Cleat-type lampholders at least 8 ft above the floor may have exposed terminals.
• 410.8: Luminaire connections must be inspectable without disconnecting any wiring (unless connected via plug and receptacle).
• 410.11: Luminaires must be constructed or guarded so combustible material is not exposed to temperatures exceeding 90°C (194°F).
• 410.12: Lampholders over highly combustible material must be the unswitched type and located at least 8 ft above the floor unless individually switched or…

Key Concepts

Purpose of the NEC (Article 90.1) The Code's purpose is the practical safeguarding of persons and property from hazards arising from the use of electricity. Critical distinction: the NEC is not a design specification or instruction manual for untrained persons. Compliance ensures an installation is essentially free from hazard — but not necessarily efficient, convenient, or adequate for future expansion.

Scope of the NEC (Article 90.2) The NEC covers installation and removal of electrical conductors, equipment, raceways, signaling/communications conductors, and optical fiber cables for: - Public and private premises (buildings, mobile homes, RVs, floating buildings) - Yards, parking lots, carnivals, industrial substations - Shore power to ships in marinas/boatyards, including leakage current monitoring - Installations used by electric utilities only if they are office…

Key Concepts

Electrical Contractors Licensing Law (G.S. Chapter 87, Article 4)

• A Limited (L) license authorizes electrical contracting work up to 600 volts and limited in scope — it does NOT cover unlimited electrical work.
• The NC Electrical Contractors' Licensing Board (NCELB) oversees licensing, discipline, and enforcement.
• Licenses are not transferable — a license issued to one entity cannot be used by another person or company.
• A qualifying party (licensee) must be actively associated with the contracting firm; if they leave, the firm must obtain a new qualifier within a set period or cease contracting.
• Performing electrical contracting without a license is a violation subject to injunction and criminal penalties.
• License renewal is required annually; failure to renew results…