One-line Diagram

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[edit] Start at Utility Company transformer.

  • Determine the available fault per Utility Company chart (PBCC 106.1.1)
    • Use either the architectural or the electrical site plan to determine which utility company serves this project.
    • Single or multiple service disconnecting means (NEC 230.Part VI)
    • Voltage, amperage, system phases and AIC rating of service entrance equipment (PBCC 106.1.1, NEC 110.9)
    • Grounding ( NEC 250.Part III , Part IV )
    • Bonding ( NEC 250.Part V )
  • Continue in linear manner from the source to the last service main, one feeder at a time.
    • Overcurrent device size and type (NEC 230.Part VII, NEC 240, NEC 310.15)
    • Feeder conductor size and type. (NEC 230.Part VII, NEC 240, NEC 310.15)
    • Panel or equipment rating. Voltage, amperage, single-phase or three-phase and AIC rating of service entrance equipment (PBCC 106.1.1, NEC 110.9)
    • Transformer overcurrent protection (NEC 450.3(A) or (B))
    • Transformer secondary conductor protection - tap rule. (NEC 240.21) NOTE: NEC 240.4 does not apply to tap conductors
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