Side-by-Side Comparison
Electrical & Wiring
Electrical Wire Color Codes vs. Electrical Conduit
Comparing 2 standards across 22 specifications. 22 key differences identified.
Comparing:
Electrical Wire Color Codes
Electrical Conduit
AC electrical wiring color codes distinguish Line (hot), Neutral, and Ground conductors, standardized in the US under NEC (120/240V Black/Red/White and 277/480V Brown/Orange/Yellow) and internationally under IEC 60446 (Brown/Black/Grey Line, Blue Neutral, Green-Yellow Ground).
Electrical conduit sizing is governed by the National Electrical Code Chapter 9 Table 1 40% fill rule for three or more conductors, matching raceway types including Electrical Metallic Tubing (EMT), Schedule 40/80 PVC, and Rigid Metal Conduit (RMC).
Specification Comparison Table
22 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
NEC Article 200/250 (US) / IEC 60446 / BS 7671 (Europe/UK) | — |
|
US 120V / 240V Phase A (Hot)
|
Black | — |
|
US 120V / 240V Phase B (Hot)
|
Red | — |
|
US 120V / 208V Phase C (Hot 3-Phase)
|
Blue | — |
|
US 120V / 240V Neutral
|
White (Continuous white or gray outer finish per NEC 200.6) | — |
|
US 277V / 480V Commercial 3-Phase (Wye)
|
Phase A: Brown | Phase B: Orange | Phase C: Yellow | Neutral: Gray (conventional scheme; this is a symmetrical wye system with no high-leg condition) | — |
|
US 120V / 240V High-Leg Delta (4-Wire, 3-Phase)
|
Phase A: Black | Phase B: Orange (NEC 110.15-mandated high-leg marking, ~208V to neutral) | Phase C: Blue | Neutral: White | — |
|
US Protective Earth / Ground
|
Bare Copper, Green, or Green with Yellow Stripe | — |
|
IEC / Europe Phase 1 (L1)
|
Brown | — |
|
IEC / Europe Phase 2 (L2)
|
Black | — |
|
IEC / Europe Phase 3 (L3)
|
Grey | — |
|
IEC / Europe Neutral (N)
|
Blue (Light Blue) | — |
|
IEC / Europe Protective Earth (PE)
|
Green with Yellow Stripe (Bi-color mandate) | — |
|
Governing Standard
|
— | NFPA 70 (NEC) Chapter 9, Tables 1, 4, and 5 |
|
1 Conductor Maximum Fill
|
— | 53% of total internal cross-sectional area |
|
2 Conductors Maximum Fill
|
— | 31% of total internal cross-sectional area |
|
3 or More Conductors Max Fill
|
— | 40% of total internal cross-sectional area (Universal Standard) |
|
1/2" EMT Conduit
|
— | ID: 0.622 in (15.8 mm) | Total Area: 0.304 sq in | 40% Usable: 0.122 sq in (9 × 12 AWG THHN max) |
|
3/4" EMT Conduit
|
— | ID: 0.824 in (20.9 mm) | Total Area: 0.533 sq in | 40% Usable: 0.213 sq in (16 × 12 AWG THHN max) |
|
1" EMT Conduit
|
— | ID: 1.049 in (26.6 mm) | Total Area: 0.864 sq in | 40% Usable: 0.346 sq in (26 × 12 AWG THHN max) |
|
2" EMT Conduit (Service Entrance)
|
— | ID: 2.067 in (52.5 mm) | Total Area: 3.356 sq in | 40% Usable: 1.342 sq in (3 × 4/0 Cu THHN) |
|
Schedule 80 PVC vs EMT
|
— | Schedule 80 has heavy thick walls; has ~15–20% smaller internal area than EMT |
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