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See Review policy for supplemental domain assurance." }, "internal_review": { "status": "not_applicable", "reviewer": null }, "page": "https://www.calculatorx.com/calc/wire/awg-to-mm", "api": "https://www.calculatorx.com/api/v1/calc/awg-to-mm", "schema_input": "https://www.calculatorx.com/schemas/electrical.awg_to_mm.input.json", "schema_output": "https://www.calculatorx.com/schemas/electrical.awg_to_mm.output.json", "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" ], "boundary_conditions": [ "Missing/empty awg → MISSING_REQUIRED_INPUT (not coerced to AWG 0)", "Unparseable awg → INVALID_NUMBER", "field not mm|mm2 → INVALID_MODE", "Integer 4/0 (−3) through 56 = standard_range + formula_derived (+ geometry.standard_nominal); non-integer n in that span → AWG_NONSTANDARD_GAUGE + formula_interpolation; n outside the span → AWG_OUTSIDE_STANDARD_RANGE + formula_extrapolation", "Lower AWG number → thicker diameter (monotonic)", "field=mm → primary diameter; field=mm2 → πd²/4 area (same geometry). UI/share `mode=awg-mm|awg-mm2` maps to field.", "Solid round conductor only — not stranded equivalent" ], "sources": [ { "title": "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", "section": "Table 1 standard nominal diameters/areas (secondary track: geometry.standard_nominal). 2026 is a reapproval of B258-18; the AWG geometric progression is unchanged.", "url": "https://www.astm.org/b0258-18r26.html", "supports": "Pinned Table 1 SI/inch-pound nominals; primary UI/API value remains the unrounded geometric progression", "kind": "standard" }, { "title": "NBS Handbook 100 — Copper Wire Tables", "section": "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", "url": "https://nvlpubs.nist.gov/nistpubs/Legacy/hb/nbshandbook100.pdf", "supports": "PRIMARY formula track: logarithmic AWG scale with d₃₆ = 0.127 mm; 100% IACS ρ = 1.7241×10⁻⁸ Ω·m", "kind": "reference" }, { "title": "100% IACS annealed copper resistivity (20 °C)", "section": "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.", "kind": "reference" }, { "title": "NFPA 70–style copper ampacity (educational; edition not pinned)", "section": "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", "kind": "reference" }, { "title": "NIST Guide to the SI (SP 811)", "section": "Millimetre as SI length unit", "url": "https://www.nist.gov/pml/special-publication-811", "supports": "Diameter in mm; area in mm²", "kind": "reference" } ], "methods": [], "fingerprint": "sha256:912d7468eb9a95fd6550fce600bb84f727602ebc17f16b288e2b8a1c46d87493", "tier": "engine_tested", "verification": { "tests": { "passed": 46, "total": 46, "golden": 13, "boundary": 6, "property": 27 }, "contract_checks": { "passed": 6, "total": 6 } }, "evidence_core_generated_at": "2026-09-10T22:48:17.762Z", "rendered_at": "2026-11-10T05:18:41.706Z", "release_integrity": { "status": "verified", "scope": "workspace", "production_attestation_required": true, "calculation_version": "1.5.0", "artifacts": { "engine": "1.5.0", "page": "1.5.0", "capability": "1.5.0", "evidence": "1.5.0", "input_schema": "1.5.0", "output_schema": "1.5.0", "mcp_contract": "1.5.0" }, "digests": { "input_schema_sha256": "871fc2ccfe8d3ea3aa8bbd7c74d37445f684f6926de3b69c4be5c80e5034648c", "output_schema_sha256": "602cbe63d52662bc4b179c09784aa891368df1ab86d1592620fdd16166f94682", "evidence_sha256": "90158d106fe39ab27ebe526550502d7d8dc24da04ce4d539fdadf21e937d7e57", "evidence_core_sha256": "90158d106fe39ab27ebe526550502d7d8dc24da04ce4d539fdadf21e937d7e57", "capability_sha256": "d744f931c28d03e04e50138bfe75c4422d15534ed4e6248c2ac65b58f0fbc72d", "engine_sha256": "c6ebd8436f08b413e1ac6317b2d48550f2e6639a90dff254244e3aa562158b8d", "mcp_contract_sha256": "eb3e39ad4a95ed263415b4932f185d5edfe00a2403267b7c5ed5f718d1ff6da3" }, "contract_checks": { "total": 6, "passed": 6, "failed": 0, "items": [ { "id": "release-artifacts-aligned", "status": "pass", "detail": "1.5.0" }, { "id": "schema-output-required-declared", "status": "pass" }, { "id": "schema-valid-input-executes", "status": "pass" }, { "id": "engine-success-output-validates-schema", "status": "pass" }, { "id": "schema-rejects-incomplete-input", "status": "pass" }, { "id": "rest-success-payload-validates-schema", "status": "pass" } ] }, "report": "https://www.calculatorx.com/.well-known/calculatorx-release-integrity.json" }, "tests": [], "disclosure": { "policy": "calculatorx-public-evidence-v1", "full_validation": "private", "representation": "summary" } }