NEC Code Reference
Instant access to National Electrical Code articles, tables, and requirements. Searchable NEC 2023 reference designed for the field.
Access NEC ReferenceWhat is the NEC?
The National Electrical Code (NEC), also known as NFPA 70, is the standard for safe electrical installation in the United States. Published by the National Fire Protection Association, the NEC is updated every three years and adopted by most states and municipalities.
Electricians must know and follow NEC requirements for every installation. Ampora provides quick, searchable access to NEC articles and tables right on your phone - no bulky code book required.
NEC Structure Overview
Chapter 1: General (Articles 90-110)
Scope, definitions, and general requirements for installations
Chapter 2: Wiring & Protection (Articles 200-285)
Branch circuits, feeders, overcurrent protection, grounding
Chapter 3: Wiring Methods (Articles 300-399)
Conduit, cable, raceways, boxes, and enclosures
Chapter 4: Equipment (Articles 400-490)
Switches, receptacles, luminaires, appliances, HVAC
Chapter 5: Special Occupancies (Articles 500-590)
Hazardous locations, healthcare, assembly, temporary wiring
Chapter 6: Special Equipment (Articles 600-695)
Signs, electric vehicles, pools, generators, fire pumps
Chapter 7: Special Conditions (Articles 700-770)
Emergency systems, standby power, fire alarm, fiber optics
Chapter 8: Communications (Articles 800-840)
Communications circuits, CATV, network-powered broadband
Chapter 9: Tables
Conductor properties, conduit fill, AC resistance, etc.
Most-Referenced NEC Articles
| Article | Topic |
|---|---|
| 210 | Branch Circuits |
| 220 | Branch-Circuit, Feeder, and Service Load Calculations |
| 230 | Services |
| 240 | Overcurrent Protection |
| 250 | Grounding and Bonding |
| 300 | General Requirements for Wiring Methods |
| 310 | Conductors for General Wiring |
| 314 | Outlet, Device, Pull, and Junction Boxes |
| 406 | Receptacles, Cord Connectors, and Attachment Plugs |
| 430 | Motors, Motor Circuits, and Controllers |
Essential NEC Tables
Table 310.16
Conductor ampacities for 0-2000V
Table 220.42
Lighting load demand factors
Table 220.55
Electric range demand factors
Table 250.122
Equipment grounding conductor sizing
Table 430.52
Motor short-circuit protection
Table 430.250
Three-phase motor FLC values
Chapter 9, Table 4
Conduit dimensions and areas
Chapter 9, Table 5
Conductor dimensions and areas
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