Intry Verified receipt
Is the Intry Pull Box Calculator accurate and NEC compliant?
The provenance receipt for the Intry Pull Box Calculator: 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.
The receipt
- Calculated from
- NEC 314.28(A) · NEC 314.28(A)(1) · NEC 314.28(A)(2) · NEC 314.28(A)(3) · NEC 314.28(B) · NEC 314.28(C), (D) and (E) · NEC 314.16 · NEC Chapter 9 Table 4 (NEC 2023). 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
- NEC 2023
- What it reads
- NEC 314.28(A)
- NEC 314.28(A)(1)
- NEC 314.28(A)(2)
- NEC 314.28(A)(3)
- NEC 314.28(B)
- NEC 314.28(C), (D) and (E)
- NEC 314.16
- NEC Chapter 9 Table 4
- Checked
- Checked on every build, most recently on October 24, 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 32786 checks, and this page has to clear them too. This is our own deterministic gate, not a third-party audit.
- Tested safeguards
- The pull box's minimum length and width, the same-conductor spacing, the 4 AWG scope and the over-6-ft flag it gives carry their own safeguards: we broke the code behind them on purpose, and the safeguards caught it.
- Source changes
- No source has been added to or removed from this tool since this record began on October 24, 2026.
- Runnable
- A reference engine behind the published numbers on this site. Runnable access is offered on the calculators exposed at the Intry MCP endpoint.
- Final say
- Your AHJ and local amendments have final say. Confirm before rough-in.
Frequently Asked Questions
Is the Intry Pull Box Calculator accurate and NEC compliant?
It computes from the NEC sections named below (NEC 2023), 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. Your AHJ and local amendments have final say. Confirm before rough-in. Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 32786 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. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.