Free, inside your AI assistant
Make your AI get the code right
Connect Intry to Claude and your AI stops guessing at the numbers. Ask any wire, load, conduit, or refrigerant question in plain English and get the real code-accurate answer, the verdict, and the exact NEC 2023 section, computed live. Free, works on your phone.
Add Intry to Claude in about 30 seconds
Claude connectors are free on every plan (including the free one) and work in the phone app. Copy the link, paste it into Claude, and start asking.
- 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.
What you can ask it to run
Intry’s most-used field calculators, all runnable from a plain-English question. Each one answers with the number, a verdict, and the cited source. Open one for example questions.
| Calculator | Trade | Answers questions like |
|---|---|---|
| Voltage Drop Calculator | Electrical | “What's the voltage drop on a 120 ft run of #10 copper at 20 A, 240 V?” |
| Wire Size Calculator | Electrical | “What size copper wire and breaker do I need for a 50 A continuous load?” |
| EV Charger Circuit Calculator | Electrical | “What wire, breaker, and ground does a 48 A hardwired EV charger need?” |
| Conduit Fill Calculator | Electrical | “Do nine #12 THHN fit in 3/4 inch EMT, or do I need to go up a size?” |
| Box Fill Calculator | Electrical | “Does a 4 inch square box hold six #12 with a receptacle and grounds?” |
| Superheat & Subcooling Calculator | HVAC | “R-410A, suction 118 psig at 55F line temp, liquid 340 at 90F. What's my superheat and is the charge right?” |
| MCA & MOCP Breaker Calculator | Electrical | “Nameplate says MCA 24.5, MOCP 40. What wire and breaker for this condenser?” |
| A2L Line Set Calculator | HVAC | “Can I reuse my R-410A line set for a new 3 ton R-454B system, 40 ft run?” |
| Existing-Load Panel Check (NEC 220.87) | Electrical | “200 A service, utility peak demand 110 A. Can it take a 48 A EV charger?” |
| Conduit Offset Bend Calculator | Electrical | “Give me the marks and shrink for a 6 inch offset at 30 degrees in 3/4 inch EMT.” |
Why the answers hold up
Computed, not remembered
Every answer runs the same locked engine our calculators use. Numbers are verified in our tests and re-checked on every release, so they hold up to an inspector.
Tells you what it means
Not just a number, a verdict: within 3%, upsize the wire, over-fill, undercharged, plus the NEC 2023 section or refrigerant data behind it.
Free and instant
Free inside Claude on every plan, on your phone, no login, no key. One paste and your assistant has it forever.
Built for the trades
NEC 2023 electrical and the R-454B / A2L refrigerant transition for HVAC, from the field calculators techs already use.
Want to keep every job, not just the answer?
Install the free Intry app and every reading saves to the job, tracks across visits, and works offline. The AI gives you the answer; the app remembers the whole job.
Frequently Asked Questions
What does this actually do?
It gives Claude (and other AI assistants) the ability to run Intry's real field calculators instead of guessing. Once connected, you just ask a question the way you would ask a coworker, 'what size wire and breaker for a 48 amp EV charger?', and the AI runs the actual code-accurate calculator and answers with the number, a verdict, and the NEC 2023 section it came from. It is a new way to run the numbers: no punching inputs into a calculator, just ask mid-job and get the answer and what to do next.
Is it free?
Yes, completely. Intry is free, and Claude's custom connectors are free on every Claude plan, including the free tier, and they work on the Claude phone app. There is no login on our end and no API key. It is about as low-commitment as a tool gets.
Do I need to know what an MCP server is?
No. You copy one link, paste it into Claude's Connectors setting, and you are done. That is the whole thing. 'MCP' is just the plumbing underneath; you never have to think about it.
Why not just ask ChatGPT or Claude directly?
General AI models answer code questions from memory, and they get NEC ampacity, derating, and the small-conductor rules wrong often enough to fail an inspection. Intry does not guess: every answer is computed by the same locked engine our website runs, and every published number is verified in our tests and re-checked on every release. The AI's reasoning plus Intry's real math is the combination you can actually stand behind on the job.
Does it work on my phone?
Yes. Claude's custom connectors work in the Claude mobile app, so you can add Intry once and then ask from your phone in the field. For saving your jobs and tracking a reading across visits, install the free Intry app too (see the link on this page).
What about ChatGPT?
Claude is the easy path today because its connectors are free and work on the phone. ChatGPT can connect too, but it currently needs a paid plan with Developer Mode turned on, so it is not as smooth for most people yet. We are leading with Claude and will add an easier ChatGPT option. Developers using ChatGPT, Cursor, or Claude Code can connect now with the snippet lower on this page.
Using ChatGPT, Cursor, or a dev tool?
Intry is a standard MCP server (Streamable HTTP, JSON-RPC 2.0) at https://www.intrysys.com/api/mcp. The tool manifest is at /api/tools. ChatGPT (Plus, Developer Mode): Settings, Connectors, add a custom connector by that URL.
claude mcp add --transport http intry https://www.intrysys.com/api/mcp
{
"mcpServers": {
"intry": {
"type": "http",
"url": "https://www.intrysys.com/api/mcp"
}
}
}Give your AI the code book.
One paste into Claude and every number your assistant gives you comes back computed and cited. Free.