Service Entrance Sizing
Size service conductors and equipment per NEC 230
Service Requirements
Minimum Conductor Size
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Service Conductors
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Neutral Size
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Grounding Electrode Conductor
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Minimum Conduit Size
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Main Breaker
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Meter Base
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NEC References
• Service conductors: NEC 230.42
• Neutral sizing: NEC 220.61
• GEC sizing: NEC 250.66, Table 250.66
• Grounding: NEC 250.24
Service Conductor Sizing Reference
| Service (A) | Copper 75°C | Aluminum 75°C | GEC (Cu) | GEC (Al) |
|---|---|---|---|---|
| 100 | 4 AWG | 2 AWG | 8 AWG | 6 AWG |
| 125 | 2 AWG | 1/0 AWG | 8 AWG | 6 AWG |
| 150 | 1 AWG | 2/0 AWG | 6 AWG | 4 AWG |
| 200 | 2/0 AWG | 4/0 AWG | 4 AWG | 2 AWG |
| 400 | 400 kcmil | 600 kcmil | 1/0 AWG | 3/0 AWG |
| 600 | 2×3/0 | 2×250 | 2/0 AWG | 4/0 AWG |
| 800 | 2×250 | 2×400 | 3/0 AWG | 250 kcmil |