Electrical / runnable MCP tool
Run the 120V Induction Range Circuit Calculator in your AI assistant
Through the free Intry MCP server, Claude, ChatGPT, or Cursor runs this exact calculator and hands back a verdict and the cited source, not a guess. Tool name: induction_range_circuit.
What you get back: wire/breaker/ground and, when a shared-circuit rating is given, the shared-circuit verdict with the arithmetic.
How it computes the answer
Computed from the NEC 210.23(B)(1) 80% (freestanding) or 210.23(B)(2) 50% (fastened cooktop) shared-circuit cap on the wall draw; the dedicated branch from NEC Table 310.16 (75°C only on terminations marked for it, 110.14(C)(1)(a)(3); 60°C and NM-B otherwise) with the 240.4(D) cap and the Table 250.122 ground, continuous at 125% per 210.20(A) for a multi-hour recharge.
What it cites
Your assistant calls the same engine the interactive calculator calls, with the inputs listed under Inputs. These are the sources that engine reads.
- NEC 210.23(B)(1) and 210.23(B)(2)
- The shared general-purpose / multi-outlet circuit cap. A freestanding cord-and-plug range is not fastened in place, so its rating may not exceed 80% of the branch (210.23(B)(1)): 12 A on a 15 A circuit, 16 A on a 20 A. A drop-in cooktop is a fixed (fastened-in-place) appliance, so the tighter 50% cap governs it (210.23(B)(2)): 7.5 A on 15 A, 10 A on 20 A. The 80% rule would over-permit a fixed cooktop, so the engine keys the cap off the unit's mounting. Fetched from the primary (p.70-85).
- NEC 210.21(B)(2) and Table 210.21(B)(2)
- The companion receptacle limit: a cord-and-plug load on a circuit with two or more receptacles is held to the same 12 A (15 A circuit) / 16 A (20 A circuit) ceiling.
- NEC 210.20(A) and Article 100 (continuous load)
- A load that runs three hours or more is continuous, so the branch and its overcurrent device are sized at 125%. A multi-hour battery recharge is the one thing that flips a plug-in range continuous, so the dedicated-circuit answer is given both ways (continuous and not) rather than asserting one.
- NEC 210.19(C)
- The conventional 240 V range this plug-in unit displaces: a household range rated 8-3/4 kW or more requires a minimum 40 A branch circuit, with the neutral permitted smaller than the ungrounded conductors by Exception No. 2 (not less than 70% of the branch rating and not smaller than #10). Verified against the NFPA 70-2023 primary (p.70-84); the 2020 NEC relocated this household-range rule to its current 210.19(C) location, which the engine cites.
- NEC Table 220.55
- The service and feeder cooking-appliance demand. A 120 V plug-in unit adds only about 1.4 to 1.8 kVA: under 1-3/4 kW it is an ordinary appliance load not in the table, and just over it, Table 220.55 Note 3 applies the Column A single-unit 80% demand factor. Either way it is NOT the 8 kW Column C figure a conventional 240 V range receives.
- NEC Table 310.16, 240.4(D), and Table 250.122
- The dedicated individual branch circuit is sized through the locked wire-size engine: conductor ampacity from Table 310.16 with the 110.14(C) terminal cap, the small-conductor overcurrent cap on #14/#12/#10 (240.4(D)), and the equipment grounding conductor from Table 250.122. Fetched from the primary.
- NEC 110.14(C)(1)(a)(3) and 334.80
- When the 75C column holds for the dedicated circuit. On a circuit rated 100 amperes or less, 110.14(C)(1)(a) allows the 75C column only where the equipment is "listed and identified for use with such conductors" (NFPA 70-2023, p. 70-65), and 334.80 holds NM-B cable to the 60C column, so each dedicated-circuit answer that holds only at 75C says so and gives the 60C conductor from the same engine.
These are NEC 2023 rules and referenced tables, looked up and applied by the engine to the wall/charge draw you enter, not field measurements. The burner peaks are battery-fed and never size the branch. The unit rating plate has the final say on the wall/charge draw, and your AHJ and local amendments govern the install.
The full receipt, with every source and how each is cross-checked, is on the interactive 120V Induction Range Circuit Calculator.
Ask your assistant
The one rule that makes it reliable: name Intry in your question. That is what tells Claude to run the induction_range_circuit tool and answer with the real number, the verdict, and the citation. Leave Intry out and Claude may just guess from memory, which is exactly what you are trying to avoid. Type something like:
Inputs
| Field | Required | Accepts | What it is |
|---|---|---|---|
| wallAmps | yes | number | The manufacturer-stated WALL / CHARGE draw in amps (e.g. 12 for the Copper Charlie, 15 for the Impulse Cooktop or Electra Induction Stove). Never the induction burner kW, which the battery supplies. |
| volts | optional | number | Wall-side voltage (default 120). |
| sharedCircuitRating | optional | 15, 20 | If set, also check whether the unit may share a general-purpose branch circuit of this rating (15 or 20 A). |
| fastenedInPlace | optional | boolean | TRUE for a drop-in cooktop or wall oven (fixed / fastened in place -> NEC 210.23(B)(2) 50% shared cap); FALSE (default) for a freestanding range (not fastened -> 210.23(B)(1) 80% cap). Only affects the shared-circuit verdict. |
Add Intry to Claude
One paste and Claude can run this tool and every other Intry calculator, right from your phone.
- Claude opens with the Intry connector already filled in. Review it and click Add.
- (If a field is blank, paste the link below into the URL field.)
- In any chat, tap + then Connectors and switch Intry on. Then name Intry in your question (“use Intry to…”) so Claude runs the tool instead of guessing.
https://www.intrysys.com/api/mcpNo login, no API key, and it works on every Claude plan, right from your phone.
Using ChatGPT, Cursor, or a dev tool? See the developer setup on the main page. The endpoint is https://www.intrysys.com/api/mcp.
Every answer comes with the cited NEC section, so you can check it or show an inspector. The numbers come from the same calculator we run on intrysys.com, and we re-check every one automatically before anything goes live, so the number Claude hands you matches the code.