Public evidence

electrical.awg_to_mm

Machine-checked verification for calculation version 1.5.0 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

CVP numerical verification covers AWG diameter/area geometry. Copper resistance is a 20 °C IACS material model. Ampacity is an educational code-context reference and is outside CVP golden numeric verification.

Declared partition coverage: PASS · 5/5 declared partitions (geometry-formula, geometry-standard-nominal, copper-resistance-model, ampacity-reference-integrity, invalid-domain)
Versions: Calculation 1.5.0 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 5/5 property · digest bc02a81f5ab3

Verification

Legacy regression suite: 46/46 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (46/46 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.5.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.5.0. CVP 1.0.0-proposed. 6/6 golden · 5/5 CVP boundary · 6/6 invalid · 5/5 property · 2/2 metamorphic · 2/2 cross-interface · 6/6 CVP contract. digest bc02a81f5ab3. CVP numerical verification covers AWG diameter/area geometry (unrounded formula + ASTM Table 1 identity). Copper resistance is a 20 °C IACS material model. Ampacity is an educational code-context reference and is outside CVP golden numeric verification.

Golden (oracle-backed) 6 / 6
CVP boundary 5 / 5
Invalid input 6 / 6
Property 5 / 5
Metamorphic 2 / 2
Cross-interface 2 / 2
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session. Human URL alias: /calc/wire/wire-gauge-chart?a=12&mode=awg-mm ≡ /calc/wire/awg-to-mm?awg=12&mode=awg-mm ≡ REST awg-to-mm and wire-gauge-chart ≡ MCP electrical.awg_to_mm.
Verified scope AWG geometry & calculation contract
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:912d7468eb9a95fd6550fce600bb84f727602ebc17f16b288e2b8a1c46d87493

Input schema sha256:871fc2ccfe8d3ea3aa8bbd7c74d37445f684f6926de3b69c4be5c80e5034648c · Output schema sha256:602cbe63d52662bc4b179c09784aa891368df1ab86d1592620fdd16166f94682 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: awg-to-mm
Engine: awg
Engine build: 2026-09-10
Evidence core: 2026-09-10T22:48:17.762Z
Rendered: 2026-11-10T05:18:41.706Z
Last reviewed: —

Assumptions

Solid round conductor of the stated AWG; no insulation.
Standard AWG logarithmic definition with d₃₆ = 0.127 mm (ASTM B258-18(2026); 2026 reapproval of B258-18).
Copper resistance uses ρ = 1.7241×10⁻⁸ Ω·m at 20 °C (NBS Handbook 100 / 100% IACS annealed copper material model).
Ampacity is an educational NFPA 70–style thermal reference (table-like 310.16); edition not pinned; not jurisdiction-usable; not a branch-circuit/OCPD rating.

Limitations

Solid round conductor geometric model (ASTM B258-18(2026); 2026 reapproval of B258-18)
Primary geometry is unrounded geometric progression (formula_derived); ASTM Table 1 SI nominals are a separate standard_nominal track for integer 4/0–56
Not stranded equivalent area or insulated OD
Copper Ω/km is a 20 °C material model, not AWG geometry
Ampacity is an educational NFPA 70–style thermal reference (table-like 310.16, edition not pinned); copper 14–4/0 include 60/75/90 °C; 16 AWG and finer not tabulated; not jurisdiction-usable and not a branch-circuit rating
CVP numeric goldens cover AWG diameter/area geometry; resistance is a 20 °C IACS material model; ampacity is dataset-integrity only, not NEC compliance
Integer 4/0 (−3) through 56 = standard_range + formula_derived (+ standard_nominal); non-integer n in that span → AWG_NONSTANDARD_GAUGE + formula_interpolation; n outside the span → AWG_OUTSIDE_STANDARD_RANGE + formula_extrapolation
Missing/empty awg → MISSING_REQUIRED_INPUT (empty is not AWG 0 / 1/0)
Unparseable awg → INVALID_NUMBER; field not mm|mm2 → INVALID_MODE

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

ASTM B258-18(2026) — Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors — Table 1 standard nominal diameters/areas (secondary track: geometry.standard_nominal). 2026 is a reapproval of B258-18; the AWG geometric progression is unchanged.
Supports: Pinned Table 1 SI/inch-pound nominals; primary UI/API value remains the unrounded geometric progression
NBS Handbook 100 — Copper Wire Tables — American Wire Gage geometric progression (No. 0000 = 0.4600 in, No. 36 = 0.0050 in, ratio 92^(1/39)); International Annealed Copper Standard volume resistivity 1.7241 μΩ·cm at 20 °C
Supports: PRIMARY formula track: logarithmic AWG scale with d₃₆ = 0.127 mm; 100% IACS ρ = 1.7241×10⁻⁸ Ω·m
100% IACS annealed copper resistivity (20 °C) — Material: annealed copper, 100% IACS; reference temperature 20 °C; ρ = 1.7241×10⁻⁸ Ω·m (NBS Handbook 100)
Supports: Copper Ω/km from area; IACS conductivity definition. Material-model reference, not ASTM B258 geometry.
NFPA 70–style copper ampacity (educational; edition not pinned) — Table-like 310.16 family: copper, not more than three current-carrying conductors, no ambient or bundling correction
Supports: Educational thermal reference only; not an adopted NFPA 70 edition or jurisdiction table; not a branch-circuit/OCPD rating
NIST Guide to the SI (SP 811) — Millimetre as SI length unit
Supports: Diameter in mm; area in mm²

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.