Side-by-Side Comparison
Electrical & Wiring
AWG Wire Sizes vs. Electrical Conduit
Comparing 2 standards across 19 specifications. 19 key differences identified.
Comparing:
AWG Wire Sizes
Electrical Conduit
The American Wire Gauge (AWG / ASTM B258) system standardizes solid round electrical conductor diameters based on a logarithmic ratio where 36 AWG equals 0.0050 inches (0.127 mm) and 4/0 (0000) AWG equals 0.4600 inches (11.684 mm) across 39 stepping steps.
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
19 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ASTM B258 / National Electrical Code (NEC) Chapter 9 Table 8 | — |
|
Geometric Stepping Ratio
|
Ratio between consecutive gauges is 39√(0.4600 / 0.0050) ≈ 1.1229322 | — |
|
Area Doubling Rule of Thumb
|
Decreasing by 3 gauge numbers doubles conductor cross-sectional area and halves resistance | — |
|
Diameter Doubling Rule
|
Decreasing by 6 gauge numbers doubles conductor diameter | — |
|
14 AWG (15A Residential Lighting)
|
Dia: 1.628 mm (0.0641 in) | Area: 2.08 mm² (4,110 cmil) | 8.286 Ω/km | — |
|
12 AWG (20A Small Appliance)
|
Dia: 2.053 mm (0.0808 in) | Area: 3.31 mm² (6,530 cmil) | 5.211 Ω/km | — |
|
10 AWG (30A Water Heater / Dryer)
|
Dia: 2.588 mm (0.1019 in) | Area: 5.26 mm² (10,380 cmil) | 3.277 Ω/km | — |
|
8 AWG (40-50A Electric Range)
|
Dia: 3.264 mm (0.1285 in) | Area: 8.37 mm² (16,510 cmil) | 2.061 Ω/km | — |
|
6 AWG (55-65A Subpanel / Cooktop)
|
Dia: 4.115 mm (0.1620 in) | Area: 13.30 mm² (26,240 cmil) | 1.296 Ω/km | — |
|
4/0 AWG (200A Residential Service)
|
Dia: 11.684 mm (0.4600 in) | Area: 107.2 mm² (211,600 cmil) | 0.1608 Ω/km | — |
|
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 |