SparkQuote NEC Calculators MCP

This MCP server exposes SparkQuote's free NEC 2023 electrical calculators as tools for AI assistants. It allows agents to perform read-only calculations for wire sizing, ampacity, voltage drop, conduit fill, box fill, load calculations, Ohm's law, panel scheduling, and bid pricing without requiring authentication or account creation.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-19Operated by SparkQuote

MCP endpoint (Streamable HTTP)

https://sparkquote.ai/mcp

Vendor documentation

What you can do with it

Calculate conductor size for a breaker or load by ampacity and voltage drop
Look up NEC Table 310.16 ampacity values for specific materials and temperatures
Compute voltage drop and percent drop for a given conductor size and load
Determine conduit fill percentage and maximum number of conductors for EMT or PVC

Tools advertised by the last live check:

wire_size
voltage_drop
watts_to_amps
conduit_fill
box_fill
load_calculator
ohms_law
panel_schedule
bid_calculator
nec_ampacity

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add sparkquote-nec-calculators-mcp --url https://sparkquote.ai/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable sparkquote-nec-calculators-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "sparkquote-nec-calculators-mcp": {
      "url": "https://sparkquote.ai/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "sparkquote-nec-calculators-mcp": {
      "type": "streamableHttp",
      "url": "https://sparkquote.ai/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start sparkquote-nec-calculators-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "sparkquote-nec-calculators-mcp": {
      "type": "http",
      "url": "https://sparkquote.ai/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

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

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "sparkquote-nec-calculators-mcp": {
      "url": "https://sparkquote.ai/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "sparkquote-nec-calculators-mcp": {
      "serverUrl": "https://sparkquote.ai/mcp"
    }
  }
}

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