SparkQuote NEC calculators

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Tools this endpoint exposes

Read directly from the endpoint on 14 Oct 2026. Not supplied by the maker.

• wire_size

  Minimum conductor size for a circuit: NEC Table 310.16 ampacity at the termination temperature rating, the 240.4(D) small-conductor limits, voltage drop over the run, and the Table 250.122 equipment g

• voltage_drop

  Voltage drop for a given conductor size, current and one-way length, single- or three-phase, from NEC Chapter 9 Table 8 circular mils (VD = 2·K·I·L / CM, or √3 for three-phase).

• watts_to_amps

  Current drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.

• conduit_fill

  Percent fill and maximum number of THHN/THWN-2 conductors of one size in EMT or PVC Schedule 40, from NEC Chapter 9 Tables 1, 4 and 5.

• box_fill

  Minimum outlet box volume from NEC 314.16(B): conductor, device (2 each), clamp and grounding allowances times the Table 314.16(B) volume for the largest conductor.

• load_calculator

  Dwelling service load by the NEC 220.82 optional method: 3 VA/ft² lighting, small-appliance and laundry circuits, fixed appliances, demand factor, heating or cooling, and the minimum standard service

• ohms_law

  Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.

• panel_schedule

  Lays circuits out on a 120/240 V single-phase or 208Y/120 V three-phase panel and totals the load per phase with the imbalance.

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