ai.sparkquote/nec-calculators

SparkQuote NEC calculators

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

Endpoint	`https://sparkquote.ai/mcp` (streamable-http)
Registry version	1.0.1
Now	10 tools · grade A (96) · pin `ts_cf7aa2773333d530029abc8b7a87df15` · protocol 2025-06-18
First / last listed	2026-10-26 00:08 UTC / 2026-10-26 00:08 UTC
Grade over time	2026-10-26: A (96), 10 tools

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Timeline

First listing · 2026-10-26 00:08 UTC
10 tools, grade A (96)

Tools: wire_size voltage_drop watts_to_amps conduit_fill box_fill load_calculator ohms_law panel_schedule bid_calculator nec_ampacity

Current tools (10)

`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 grounding conductor, increased in proportion under 250.122(B) when voltage drop upsizes the conductors. params: material, temp, amps, volts, phase, feet, limit*
`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). params: material, awg, amps, volts, phase, feet
`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. params: watts, volts, phase, pf
`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. params: type, size, awg, count
`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. params: awg, conductors, devices, clamps, grounds*
`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 size. Leave an appliance out to count it as 0 VA. params: sqft, small, laundry*, range, dryer, heater, dishwasher, disposal, ev, other, hvac
`ohms_law`	Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated. params: v, i, r, p
`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. params: system, spaces, circuits*
`bid_calculator`	Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)). params: materials, markup, hours, rate, direct, overhead, margin*
`nec_ampacity`	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. params: material, temp, size*

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