Intry Verified receipt

Is the Intry Outdoor HVAC GFCI Requirement (NEC 210.8(F)) accurate and NEC compliant?

The provenance receipt for the Intry Outdoor HVAC GFCI Requirement (NEC 210.8(F)): the exact authority its values derive from, the edition they are keyed to, who has final say, and what our automated checks hold them against, rebuilt from their cited source.

Short answer: It computes from the NEC sections named below, and our automated checks hold its answers against values written from those sources for the cases the checks cover, not for every input you can enter. Whether an installation is NEC compliant is decided by the inspector, not by a calculator. This answer holds only for a jurisdiction whose own amendment to 210.8(F) and current-code listing the tool holds, where the two agree and reach dwellings. Everywhere else the tool refuses, and your AHJ has the final say in every case. Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 35,006 automated checks, one suite for the whole site rather than a per-tool count, re-derive the numbers before each deploy from the tables this site holds, read from the cited NEC section together with your state's own amendment to it. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.

The receipt

Calculated from

NEC 210.8(F), read from the printed books (2020, 2023, 2026) and the 2020 edition's TIA · TIA 20-19 and TIA 23-3, the lineage of the exception itself · Each state's own amendment to 210.8(F), where we hold it · Each state's own current-code listing, for what is in force today · The NEC adoption table, for the edition shown where the tool holds no state amendment · The state documents this tool answers from · NFPA's documents on 210.8(F) · The adoption table's documents this page shows. Reused word for word from the locked engine, never re-written for this page. The documents it rests on are listed in the source receipt on the tool page.

Edition

the edition each state enforces on the job date: the NEC 2020, 2023 or 2026 text of 210.8(F), as that state amends it

What it reads

NEC 210.8(F), read from the printed books (2020, 2023, 2026) and the 2020 edition's TIA
TIA 20-19 and TIA 23-3, the lineage of the exception itself
Each state's own amendment to 210.8(F), where we hold it
Each state's own current-code listing, for what is in force today
The NEC adoption table, for the edition shown where the tool holds no state amendment
The state documents this tool answers from
NFPA's documents on 210.8(F)
The adoption table's documents this page shows

Its pages also cite NEC 2023 230.67.

Checked

Checked on every build, most recently on November 11, 2026. On every build, an automated check runs the locked engine that produces these figures and holds its answers against the values this site holds, written from the source it cites, so a checked number answers to its source and not merely to itself. The check covers the cases someone wrote a check for, not every input the tool accepts: it tells you where a number comes from, and it is not a proof of every value. As of the current build that suite holds 35,006 checks, and this page has to clear them too. This is our own deterministic gate, not a third-party audit.

Tested safeguards

The GFCI requirement and ampere limit it gives under the national rule, the reading it saves where a state deleted 210.8(F), and the day the listed HVAC exception ends, carry their own safeguards: when the code behind them is broken on purpose, the safeguards catch it.

What it refuses or sets aside

For a state that rewrote NEC 210.8(F) in its own words, such as Oregon, it declines to apply the national rule and says what that state's code does instead.

Source changes

October 27, 2026: 2021 International Residential Code, Chapter 1 Scope and Administration (codes.iccsafe.org) added
October 27, 2026: 2021 International Residential Code, Chapter 34 General Requirements (codes.iccsafe.org) added
October 27, 2026: Building Codes Council Frequently Asked Questions (llr.sc.gov) added

Sources last changed: October 27, 2026.

Runnable

Exposed at the Intry MCP endpoint. An AI assistant can run this calculator, and before each release an automated check confirms the answer it returns is identical to the one the website's own engine produces.

Final say

This answer holds only for a jurisdiction whose own amendment to 210.8(F) and current-code listing the tool holds, where the two agree and reach dwellings. Everywhere else the tool refuses, and your AHJ has the final say in every case.

Frequently Asked Questions

Is the Intry Outdoor HVAC GFCI Requirement (NEC 210.8(F)) accurate and NEC compliant?

It computes from the NEC sections named below, and our automated checks hold its answers against values written from those sources for the cases the checks cover, not for every input you can enter. Whether an installation is NEC compliant is decided by the inspector, not by a calculator. This answer holds only for a jurisdiction whose own amendment to 210.8(F) and current-code listing the tool holds, where the two agree and reach dwellings. Everywhere else the tool refuses, and your AHJ has the final say in every case. Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 35,006 automated checks, one suite for the whole site rather than a per-tool count, re-derive the numbers before each deploy from the tables this site holds, read from the cited NEC section together with your state's own amendment to it. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.

Use it

Open the Outdoor HVAC GFCI Requirement (NEC 210.8(F))The full Intry Verified standard Run it in your AI assistant