Side-by-Side Comparison
Electrical & Wiring
Electrical Wire Color Codes vs. Circuit Breaker Sizes & Amperage
Comparing 2 standards across 21 specifications. 21 key differences identified.
Comparing:
Electrical Wire Color Codes
Circuit Breaker Sizes & Amperage
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).
Residential and commercial circuit breakers are standardized under National Electrical Code (NEC Article 240) and UL 489 into standard continuous trip ratings (15A, 20A, 30A, 40A, 50A, 60A, 100A, 200A), single-pole (120V) vs double-pole (240V) formats, and mandatory AFCI/GFCI protection types.
Specification Comparison Table
21 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
NEC Article 200/250 (US) / IEC 60446 / BS 7671 (Europe/UK) | NFPA 70 (NEC) / UL 489 / NEMA AB 1 (Circuit Breakers) |
|
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) | — |
|
15-Amp Single Pole (120V)
|
— | Wire Gauge: 14 AWG Copper | Standard residential lighting and general bedroom/living outlets |
|
20-Amp Single Pole (120V)
|
— | Wire Gauge: 12 AWG Copper | Kitchen countertop, bathroom receptacles, laundry, garage, workshop |
|
30-Amp Double Pole (240V)
|
— | Wire Gauge: 10 AWG Copper | Electric clothes dryers, 30-gallon water heaters, small RV hookups |
|
40-Amp Double Pole (240V)
|
— | Wire Gauge: 8 AWG Copper | Electric cooking ranges, cooktops, heat pump auxiliary heat |
|
50-Amp Double Pole (240V)
|
— | Wire Gauge: 6 AWG Copper | Level 2 EV charging (NEMA 14-50), commercial cooking ovens |
|
60-Amp Double Pole (240V)
|
— | Wire Gauge: 4 AWG Copper (or 6 AWG THHN) | Central air conditioning compressors, sub-panel feeds |
|
100A–200A Main Service
|
— | 2/0 AWG Copper / 4/0 AWG Aluminum | Main residential service disconnect panel |
|
80% Continuous Load Rule
|
— | NEC 210.20: Continuous loads (operating 3+ hours) must not exceed 80% of breaker rating (e.g. 16A max on 20A breaker) |
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