Electrical / runnable MCP tool
Run the Box Fill Calculator in your AI assistant
Through the free Intry MCP server, ChatGPT, Claude, or Cursor runs this exact calculator and hands back a verdict and the cited source, not a guess. Tool name: box_fill.
Ask your assistant
Once Intry is connected, type a question like these. The assistant recognizes the job and calls the box_fill tool, then answers with the number, the verdict, and the citation.
Inputs
| Field | Required | What it is |
|---|---|---|
| boxType | optional | Standard box type key (e.g. '4x1-1/2 square'), or omit and pass customVolume. |
| customVolume | optional | Box volume in cubic inches (overrides boxType). |
| conductors | yes | Insulated conductors entering the box. |
| deviceYokes | optional | Number of devices (switch/receptacle yokes). Default 0. |
| largestDeviceConductor | optional | Largest conductor on a device. Default largest present. |
| internalClamps | optional | Internal cable clamps present? Default false. |
| largestClampConductor | optional | Largest conductor for the clamp allowance. |
| egcCount | optional | Number of equipment grounds. Default 0. |
| largestEgc | optional | Largest EGC size. |
| terminalBlocks | optional | Number of internal terminal blocks. Default 0. |
| luminaireStud | optional | Fixture stud present? Default false. |
| hickey | optional | Hickey present? Default false. |
Add Intry to Claude (free)
One paste and Claude can run this tool and every other Intry calculator. Free on every plan, works on your phone.
- Open Claude and go to Settings, then Connectors (works on the phone app too).
- Tap Add custom connector and paste the Intry link below.
- Tap Add. Done. Now just ask Claude any wire, load, conduit, or refrigerant question.
https://www.intrysys.com/api/mcpFree inside Claude, on every plan (including the free one) and on your phone. No login on our end, no API key.
Using ChatGPT, Cursor, or a dev tool? See the developer setup on the main page. The endpoint is https://www.intrysys.com/api/mcp.
The tool returns its governing citation with every call (for example the NEC 2023 section or the refrigerant pressure-temperature data). Numbers are computed by the same locked engine the interactive calculator uses, golden-verified in CI and gated on every deploy.