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