SparkQuote NEC calculators

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.

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Measured tools (10)

• wire_size read-only

  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 grounding conductor, increased in proportion under 250.122(B) when voltage drop upsizes the conductors.

  Parameters:

  • material (required) — string — Conductor. "cu" = Copper; "al" = Aluminum.
  • temp (required) — string — Termination rating. "60" = 60°C (NM-B, UF); "75" = 75°C (THHN in conduit); "90" = 90°C.
  • amps (required) — number — Breaker / load (A).
  • volts (required) — string — Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
  • phase (required) — string — Phase. "1" = Single-phase; "3" = Three-phase.
  • feet (required) — number — One-way distance (ft).
  • limit (required) — number — Max voltage drop (%).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• voltage_drop read-only

  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).

  Parameters:

  • material (required) — string — Conductor. "cu" = Copper; "al" = Aluminum.
  • awg (required) — string — Size. "14" = 14 AWG; "12" = 12 AWG; "10" = 10 AWG; "8" = 8 AWG; "6" = 6 AWG; "4" = 4 AWG; "3" = 3 AWG; "2" = 2 AWG; "1" = 1 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" = 4/0 AWG; "250" = 250 kcmil; "300" = 300 kcmil; "350" = 350 kcmil; "400" = 400 kcmil; "500" = 500 kcmil.
  • amps (required) — number — Load current (A).
  • volts (required) — string — Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
  • phase (required) — string — Phase. "1" = Single-phase; "3" = Three-phase.
  • feet (required) — number — One-way distance (ft).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• watts_to_amps read-only

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

  Parameters:

  • watts (required) — number — Power (W).
  • volts (required) — string — Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
  • phase (required) — string — Phase. "1" = Single-phase; "3" = Three-phase.
  • pf (required) — number — Power factor.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• conduit_fill read-only

  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.

  Parameters:

  • type (required) — string — Conduit type. "EMT" = EMT; "PVC-40" = PVC Schedule 40.
  • size (required) — string — Trade size. "1" = 1"; "2" = 2"; "3" = 3"; "4" = 4"; "1/2" = 1/2"; "3/4" = 3/4"; "1-1/4" = 1-1/4"; "1-1/2" = 1-1/2"; "2-1/2" = 2-1/2"; "3-1/2" = 3-1/2".
  • awg (required) — string — THHN/THWN-2 size. "1" = 1 AWG; "2" = 2 AWG; "3" = 3 AWG; "4" = 4 AWG; "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" = 4/0 AWG.
  • count (required) — number — Number of conductors.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• box_fill read-only

  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.

  Parameters:

  • awg (required) — string — Largest conductor. "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "16" = 16 AWG; "18" = 18 AWG.
  • conductors (required) — number — Insulated conductors (not counting grounds).
  • devices (required) — number — Devices (switches, receptacles).
  • clamps (required) — string — Internal cable clamps. "0" = None; "1" = One or more.
  • grounds (required) — string — Equipment grounding conductors. "0" = None; "1" = One or more.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• load_calculator read-only

  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 size. Leave an appliance out to count it as 0 VA.

  Parameters:

  • sqft (required) — number — Living area (ft²).
  • small (required) — number — Small-appliance circuits.
  • laundry (required) — string — Laundry circuit. "1" = Yes (1,500 VA); "0" = No.
  • ev — number — EV charger (VA). Optional.
  • hvac — number — Largest of heating or cooling (VA). Optional.
  • dryer — number — Dryer (VA). Optional.
  • other — number — Other fixed appliances (VA). Optional.
  • range — number — Range / cooktop (VA). Optional.
  • heater — number — Water heater (VA). Optional.
  • disposal — number — Disposal (VA). Optional.
  • dishwasher — number — Dishwasher (VA). Optional.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• ohms_law read-only

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

  Parameters:

  • i — number — Current (A). Optional.
  • p — number — Power (W). Optional.
  • r — number — Resistance (Ω). Optional.
  • v — number — Voltage (V). Optional.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• panel_schedule read-only

  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.

  Parameters:

  • system (required) — string — Panel. "1" = 120/240 V single-phase; "3" = 208Y/120 V three-phase.
  • spaces (required) — string — Spaces. "12" = 12; "20" = 20; "24" = 24; "30" = 30; "42" = 42.
  • circuits (required) — string — Circuits: description, breaker A, poles, VA (one per line)

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• bid_calculator read-only

  Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).

  Parameters:

  • materials (required) — number — Material cost ($).
  • hours (required) — number — Labor hours (h).
  • rate (required) — number — Burdened labor cost ($/h).
  • overhead (required) — number — Overhead (% of direct cost) (%).
  • margin (required) — number — Target net margin (%).
  • direct — number — Permits and other job costs ($). Optional.
  • markup — number — Material markup (%). Optional.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• nec_ampacity read-only

  Allowable ampacity of one insulated conductor from NEC Table 310.16 (not more than three current-carrying conductors in a raceway or cable, 30°C ambient), before any adjustment or correction factors and before the 240.4(D) small-conductor limits.

  Parameters:

  • material (required) — string — "cu" = copper; "al" = aluminum.
  • temp (required) — string — Temperature column in °C: 60 (NM-B, UF), 75 (THWN, most terminations), 90 (THHN, for derating).
  • size (required) — string — Conductor size: AWG ("14" … "4/0") or kcmil ("250" … "500").

  Hints: read-only yes · destructive no · idempotent yes · open-world no

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