SparkQuote NEC calculators

by sparkquote.ai · remote · no sign-in to list tools · v1.0.1 · published by ai.sparkquote

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

Deletes · 1Changes · 9

Compare Registry entry

10 tools: 1 can delete or cancel things and 9 change things.

Scanned Oct 21, 2026

Deletes or cancels1Claude Code: deny: see these tools
Can't be undone0Claude Code: ask
Changes things9Claude Code: ask: see these tools
Only reads0Claude Code: allow

5 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http nec-calculators https://sparkquote.ai/mcp

Findings

Matches of fixed checks, with the text they matched.

5 warn

Warnvoltage_drop
The server marks "voltage_drop" read-only (readOnlyHint: true), and its own name, description or input give the class "destructive".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
What this check looks for
Warnvoltage_drop
The server marks "voltage_drop" not destructive (destructiveHint: false), and its own name, description or input give the class "destructive".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
What this check looks for
Warnconduit_fill
The server marks "conduit_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "conduit_fill" says "fill": a word for a change.
What this check looks for
Warnbox_fill
The server marks "box_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "box_fill" says "fill": a word for a change.
What this check looks for
Warnpanel_schedule
The server marks "panel_schedule" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "panel_schedule" says "schedule": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Deletes or cancels 1Removes, cancels or revokes something.Claude Code: deny

voltage_dropVoltage 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).2 findings
Why it is in this group
- The name "voltage_drop" says "drop": a word for removing or ending something.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- The server marks it not destructive (destructiveHint: false), but an annotation never lowers a class.
Findings
- Warn
  The server marks "voltage_drop" read-only (readOnlyHint: true), and its own name, description or input give the class "destructive".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
  What this check looks for
- Warn
  The server marks "voltage_drop" not destructive (destructiveHint: false), and its own name, description or input give the class "destructive".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
  What this check looks for
Description, as the server wrote it
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).
Annotations the server declares
- title: Voltage drop calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Changes things 9Creates or changes something that can be changed back.Claude Code: ask

bid_calculatorElectrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).
Annotations the server declares
- title: Electrical bid calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
box_fillMinimum 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.1 finding
Why it is in this group
- The name "box_fill" says "fill": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "box_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "box_fill" says "fill": a word for a change.
  What this check looks for
Description, as the server wrote it
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.
Annotations the server declares
- title: Box fill calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
conduit_fillPercent 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 5.1 finding
Why it is in this group
- The name "conduit_fill" says "fill": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "conduit_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "conduit_fill" says "fill": a word for a change.
  What this check looks for
Description, as the server wrote it
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.
Annotations the server declares
- title: Conduit fill calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
load_calculatorDwelling 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 minim…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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.
Annotations the server declares
- title: Residential load calculator (NEC 220.82)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
nec_ampacityAllowable 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 …No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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.
Annotations the server declares
- title: NEC Table 310.16 ampacity lookup
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
ohms_lawOhm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.
Annotations the server declares
- title: Ohm's law calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
panel_scheduleLays 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.1 finding
Why it is in this group
- The name "panel_schedule" says "schedule": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "panel_schedule" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "panel_schedule" says "schedule": a word for a change.
  What this check looks for
Description, as the server wrote it
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.
Annotations the server declares
- title: Panel schedule generator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
watts_to_ampsCurrent drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Current drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.
Annotations the server declares
- title: Watts to amps calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
wire_sizeMinimum 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…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
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.
Annotations the server declares
- title: Wire size calculator
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http nec-calculators https://sparkquote.ai/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__nec-calculators__wire_size",
      "mcp__nec-calculators__watts_to_amps",
      "mcp__nec-calculators__conduit_fill",
      "mcp__nec-calculators__box_fill",
      "mcp__nec-calculators__load_calculator",
      "mcp__nec-calculators__ohms_law",
      "mcp__nec-calculators__panel_schedule",
      "mcp__nec-calculators__bid_calculator",
      "mcp__nec-calculators__nec_ampacity"
    ],
    "deny": [
      "mcp__nec-calculators__voltage_drop"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as nec-calculators. Review it before you use it.

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Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/ai.sparkquote/nec-calculators/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 17:43 UTC.

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