NEC Quick-Reference Tables

Free, field-ready reference values from the National Electrical Code (NEC 2023). Bookmark these pages for fast jobsite lookups — no login required.

• Section 210.8 — GFCI Protection Requirements

  Which locations require GFCI protection in dwelling and non-dwelling units. Covers bathrooms, kitchens, garages, outdoors, crawl spaces, and non-residential commercial spaces.

  NEC 2023

• Section 210.12 — AFCI Protection Requirements

  Arc-fault protection requirements for 120V, 15A and 20A branch circuits in dwelling units. Covers permitted protection methods and key exceptions.

  NEC 2023

• Table 310.16 — Allowable Ampacities

  Copper and aluminum conductor ampacity at 60°C, 75°C, and 90°C temperature ratings. Up to 3 current-carrying conductors in a raceway.

  NEC 2023

• Chapter 9, Table 1 — Conduit Fill

  Maximum fill percentages for raceways: 53 % for 1 conductor, 31 % for 2, 40 % for 3 or more.

  NEC 2023

• Table 314.16(A) — Metal Box Volumes

  Cubic-inch volumes for standard device and square outlet boxes used when calculating box fill per NEC Section 314.16.

  NEC 2023

• Article 250 — Grounding & Bonding

  Grounding electrode types, GEC sizing (Table 250.66), EGC sizing (Table 250.122), main bonding jumper, and bonding requirements for metal piping and structural steel.

  NEC 2023

• Article 230 — Services

  Overhead service-drop clearances (230.24), clearances from openings (230.9), number of services permitted, service disconnect requirements, and underground service-lateral rules.

  NEC 2023

• Article 430 — Motor Branch Circuits & Control

  Motor conductor sizing (125% rule), overload protection percentages, SCPD maximum ratings from Table 430.52, and disconnecting means requirements.

  NEC 2023

• Section 300.5 — Underground Burial Depths

  Minimum cover for direct-buried UF cable, PVC and metal conduit, residential GFCI branch circuits, and runs under driveways and streets.

  NEC 2023

• Section 110.26 — Working Space & Clearances

  Required working space in front of panels and equipment — 3 ft depth, 30 in. width, 6½ ft headroom — plus dedicated space and egress rules.

  NEC 2023

• Section 210.52 — Dwelling Receptacle Placement

  The 6 ft / 12 ft wall rule, kitchen countertop spacing, the 2023 island change, and bathroom, laundry, garage, outdoor, and hallway requirements.

  NEC 2023

• Article 240 — Overcurrent Protection Basics

  Standard breaker ratings (240.6), the next-size-up rule (240.4(B)), the 14/12/10 AWG small-conductor caps, and device location rules.

  NEC 2023

• Article 625 — EV Charger Circuits

  Dedicated branch circuits, 125% continuous-load sizing with common charger-to-breaker pairings, GFCI for EV receptacles, and disconnect rules.

  NEC 2023

• Article 680 — Pools: Receptacles, GFCI & Bonding

  Receptacle distances from the pool wall, GFCI for pumps and outlets, luminaire clearances, and the 8 AWG equipotential bonding grid.

  NEC 2023

• Section 690.12 — Solar PV Rapid Shutdown

  The 30V outside / 80V inside array-boundary limits, the 30-second clock, initiation devices, and which systems are exempt.

  NEC 2023

• Article 358 — EMT: Uses, Fill & Support

  Where EMT is permitted, THHN fill counts for 1/2 to 1 in. trade sizes, 10 ft / 3 ft support spacing, and wet-location fitting rules.

  NEC 2023

• Section 404.2(C) — Neutral at Switch Locations

  When a grounded conductor is required in switch boxes, the raceway and accessible-framing exceptions, and switch grounding under 404.9(B).

  NEC 2023

• Section 408.4 — Panel Labeling & Circuit Directories

  Legible, specific circuit directories, the no-transient-descriptions rule, spare marking, remote-feed identification, and 408.36 protection.

  NEC 2023