SparkQuote NEC calculators
NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.
Connect it
Settings → Connectors → Add custom connector
URL: https://sparkquote.ai/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://sparkquote.ai/mcp{
"mcpServers": {
"nec-calculators": {
"url": "https://sparkquote.ai/mcp"
}
}
}claude mcp add --transport http nec-calculators https://sparkquote.ai/mcp{
"servers": {
"nec-calculators": {
"type": "http",
"url": "https://sparkquote.ai/mcp"
}
}
}10 tools, verified live
wire_sizeread-onlyMinimum 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.
voltage_dropread-onlyVoltage 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_ampsread-onlyCurrent drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.
conduit_fillread-onlyPercent 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_fillread-onlyMinimum 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_calculatorread-onlyDwelling 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.
ohms_lawread-onlyOhm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.
panel_scheduleread-onlyLays 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.
bid_calculatorread-onlyElectrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).
nec_ampacityread-onlyAllowable 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.
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