{
  "protocol": {
    "name": "CVP",
    "version": "1.0.0-proposed",
    "revision": "2026-09-13",
    "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148",
    "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0"
  },
  "document_status": "proposed",
  "calculator": {
    "id": "awg-to-mm",
    "version": "1.5.0",
    "title": "AWG to mm / mm² Calculator",
    "formula_family": "awg-geometry",
    "capability_id": "electrical.awg_to_mm",
    "verification_revision": "2026-10-28.meta-metrics-v2"
  },
  "profile": "engineering",
  "verified_scope": "AWG geometry & calculation contract",
  "status": "VERIFIED",
  "verification_status": "VERIFIED",
  "production_freshness": "CURRENT",
  "overall_trust": "VERIFIED",
  "runner": {
    "name": "cvp-runner",
    "version": "1.0.0"
  },
  "environment": {
    "runtime": "node",
    "runtime_version": "22.20.0",
    "numeric_model": "IEEE-754 binary64",
    "os": "darwin"
  },
  "suite": {
    "id": "awg-to-mm",
    "version": "1.5.0",
    "uri": "https://www.calculatorx.com/evidence/electrical.awg_to_mm/1.5.0.json",
    "verification_revision": "2026-10-28.meta-metrics-v2"
  },
  "obligation_set": [
    "CVP-PROV-01",
    "CVP-MODEL-01",
    "CVP-SCOPE-01",
    "CVP-UNIT-01",
    "CVP-REF-01",
    "CVP-GOLD-01",
    "CVP-BND-01",
    "CVP-INV-01",
    "CVP-NUM-01",
    "CVP-COV-01",
    "CVP-CONTRACT-01",
    "CVP-DEP-01",
    "CVP-ART-01",
    "CVP-PROD-01",
    "CVP-DIM-01",
    "CVP-PROP-01",
    "CVP-META-01",
    "CVP-IFACE-01"
  ],
  "provenance": {
    "mode": "direct",
    "sources": [
      {
        "label": "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",
        "kind": "standard",
        "reference": "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"
      },
      {
        "label": "NBS Handbook 100 — Copper Wire Tables",
        "kind": "other",
        "reference": "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"
      },
      {
        "label": "100% IACS annealed copper resistivity (20 °C)",
        "kind": "other",
        "reference": "Material: annealed copper, 100% IACS; reference temperature 20 °C; ρ = 1.7241×10⁻⁸ Ω·m (NBS Handbook 100)"
      },
      {
        "label": "NFPA 70–style copper ampacity (educational; edition not pinned)",
        "kind": "other",
        "reference": "Table-like 310.16 family: copper, not more than three current-carrying conductors, no ambient or bundling correction"
      },
      {
        "label": "NIST Guide to the SI (SP 811)",
        "kind": "other",
        "reference": "Millimetre as SI length unit",
        "url": "https://www.nist.gov/pml/special-publication-811"
      }
    ]
  },
  "controls": {
    "CVP-PROV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Sources present on evidence"
    },
    "CVP-MODEL-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Primary geometry is formula_derived; ASTM Table 1 is standard_nominal only for integer 4/0–56"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "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."
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "AWG → mm / mm²"
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 Table 1 identity + O2 formula expected_values/numerical_behavior; 60/60 SI-row identity vs IUT standard_nominal"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "13/13 legacy golden; 6/6 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "5/5 CVP boundary · 6/6 legacy Evidence boundary"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "4 Evidence illegal-input + 2/2 oracle-backed error-code (exact_error_match, not ULP)"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=1; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "5/5 declared partitions (geometry-formula, geometry-standard-nominal, copper-resistance-model, ampacity-reference-integrity, invalid-domain) · 13 legacy golden / 5 CVP boundary unique cases · 4 Evidence invalid-input (may overlap boundary)"
    },
    "CVP-CONTRACT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "6/6 CVP contract · 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"
    },
    "CVP-DEP-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "engine awg; Node binary64"
    },
    "CVP-ART-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry"
    },
    "CVP-PROD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "this calculator CURRENT · bound snapshot pass @ 2026-10-29T01:22:37.788Z · live site-wide report stale @ 2026-10-29T01:23:07.226Z (165 other capabilities) · local checks pass · attestation_id=52c69c777f14b3653d6a0d99fffe81ea840d401226015698a80d3880c8382ade · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-10-29T01:22:37.788Z · Live production status STALE (165 capabilities; 211 remain CURRENT) @ 2026-10-29T01:23:07.226Z · Public schema 1.5.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.5.0 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · cvp-immutable-manifest-fetch=pass · cvp-immutable-manifest-sha256=pass · cvp-latest-alias-matches-immutable=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae · verified_at=2026-10-28T10:42:00.223Z · evidence_attested_at=2026-10-28T10:42:00.223Z · last_confirmed_current_at=2026-10-29T01:22:37.788Z · rendered_at=2026-10-29T01:23:07.456Z · binds=cvp_core_sha256",
      "check_result": "PASS",
      "production_state": "CURRENT",
      "binding_current": true
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "Wire diameter and cross-section"
    },
    "CVP-PROP-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "5/5 property"
    },
    "CVP-META-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "2/2 metamorphic; domain=1; input-contract=1; limited to assessed relations/preconditions"
    },
    "CVP-ROUND-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No inverse / round-trip vectors in pack — control not in obligation set"
    },
    "CVP-XCAL-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set"
    },
    "CVP-IFACE-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). 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."
    },
    "CVP-ORACLE-01": {
      "result": "SKIP",
      "applicability": "higher_assurance",
      "notes": "O2 present; O3 not required this wave"
    },
    "CVP-EXP-01": {
      "result": "SKIP",
      "applicability": "optional",
      "notes": "named expert review not performed"
    }
  },
  "interfaces": {
    "compared": [
      "ui-ssr",
      "rest",
      "mcp"
    ],
    "result": "PASS",
    "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). 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."
  },
  "artifacts": {
    "evidence_bundle_sha256": "b3188836a53026c1bcc1043bd275feeace81213d068c9a639d4d96d5017fb2a0",
    "evidence_digest": "bc02a81f5ab3670590864ffb4b895ac5b740d34265de615da7ae778320e16ee8",
    "production_sha256": "0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae",
    "attested_catalog_sha256": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c",
    "production_checks": [
      {
        "id": "electrical.awg_to_mm:output-const",
        "status": "pass",
        "detail": "output const 1.5.0 vs capability 1.5.0",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:evidence-sha256",
        "status": "pass",
        "detail": "90158d106fe3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:semantic-contract",
        "status": "pass",
        "detail": "46/46",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:capability-html-public-origin-agree",
        "status": "pass",
        "detail": "public 1.5.0 vs origin 1.5.0",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:cvp-manifest-public-origin-agree",
        "status": "pass",
        "detail": "electrical.awg_to_mm/1.5.0/2026-10-28.meta-metrics-v2/engineering/bc02a81f5ab3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z",
        "projection_compared": false
      },
      {
        "id": "electrical.awg_to_mm:cvp-latest-alias-agrees",
        "status": "pass",
        "detail": "electrical.awg_to_mm/1.5.0/2026-10-28.meta-metrics-v2/engineering/bc02a81f5ab3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z",
        "projection_compared": false
      },
      {
        "id": "electrical.awg_to_mm:cvp-immutable-manifest-fetch",
        "status": "pass",
        "detail": "public=200 origin=200",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:cvp-immutable-manifest-sha256",
        "status": "pass",
        "detail": "bc02a81f5ab3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:cvp-latest-alias-matches-immutable",
        "status": "pass",
        "detail": "electrical.awg_to_mm/1.5.0/2026-10-28.meta-metrics-v2/engineering/bc02a81f5ab3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z",
        "projection_compared": false
      },
      {
        "id": "electrical.awg_to_mm:calculator-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      },
      {
        "id": "electrical.awg_to_mm:evidence-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-10-28T10:42:00.223Z"
      }
    ],
    "digest_registry": {
      "digest_algorithm": "sha256",
      "canonicalization": "json-sorted-keys-utf8",
      "entries": [
        {
          "name": "cvp_core_sha256",
          "field": "artifacts.cvp_core_sha256",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "bc02a81f5ab3670590864ffb4b895ac5b740d34265de615da7ae778320e16ee8",
          "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts"
        },
        {
          "name": "cvp_evidence_digest",
          "field": "artifacts.evidence_digest",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "bc02a81f5ab3670590864ffb4b895ac5b740d34265de615da7ae778320e16ee8",
          "note": "Alias of cvp_core_sha256 (historical field name)"
        },
        {
          "name": "artifact_evidence_sha256",
          "field": "release_integrity.digests.evidence_core_sha256",
          "digest_scope": "evidence_artifact_core",
          "value": "90158d106fe39ab27ebe526550502d7d8dc24da04ce4d539fdadf21e937d7e57",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "bc02a81f5ab3670590864ffb4b895ac5b740d34265de615da7ae778320e16ee8"
  },
  "dependencies": [
    {
      "name": "awg-engine",
      "version": "1.5.0"
    },
    {
      "name": "awg-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "node",
      "version": "22.20.0"
    }
  ],
  "attestation": {
    "status": "CURRENT",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "52c69c777f14b3653d6a0d99fffe81ea840d401226015698a80d3880c8382ade",
    "attested_at": "2026-10-28T10:42:00.223Z",
    "last_confirmed_current_at": "2026-10-29T01:22:37.788Z",
    "site_attestation_current": false,
    "capability_attestation_current": true,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-10-29T01:22:37.788Z",
    "live_updated_at": "2026-10-29T01:23:07.226Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-10-29T01:22:37.788Z",
      "site_stale_count": 165
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 165,
    "site_stale_capability_count": 165,
    "evidence_attested_at": "2026-10-28T10:42:00.223Z"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.5.0",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-10-28T10:42:00.223Z",
    "generated_at": "2026-10-28T10:42:00.223Z",
    "rendered_at": "2026-10-29T01:23:07.456Z",
    "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report."
  },
  "tests": {
    "golden": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "boundary": {
      "passed": 5,
      "total": 5,
      "failed": 0
    },
    "invalid": {
      "passed": 6,
      "total": 6,
      "failed": 0,
      "comparison": "exact_error_match"
    },
    "property": {
      "passed": 5,
      "total": 5,
      "failed": 0,
      "claim_scope": "Table 1 identity, 20 °C IACS resistance model, and pinned educational ampacity dataset integrity — not NEC compliance"
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0
    },
    "metamorphic": {
      "passed": 2,
      "total": 2,
      "failed": 0
    },
    "contract": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "cross_interface": {
      "passed": 2,
      "total": 2,
      "failed": 0
    }
  },
  "numerical": {
    "representation": "IEEE-754 binary64",
    "tolerance": {
      "type": "ulp",
      "value": 2,
      "rationale": "Unrounded AWG geometric diameter/area; ≤2 ULP vs separate-module O2 (same V8). Declared a priori. ASTM Table 1 is a separate exact nominal track.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 1,
    "claim_scope": "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."
  },
  "coverage": {
    "partitions": [
      {
        "id": "geometry-formula",
        "description": "Unrounded AWG diameter/area formula",
        "exercised": true,
        "case_count": 23
      },
      {
        "id": "geometry-standard-nominal",
        "description": "ASTM B258 Table 1 standard nominal identity",
        "exercised": true,
        "case_count": 2
      },
      {
        "id": "copper-resistance-model",
        "description": "20 °C IACS copper resistance material model",
        "exercised": true,
        "case_count": 1
      },
      {
        "id": "ampacity-reference-integrity",
        "description": "Pinned educational ampacity dataset integrity (not NEC compliance)",
        "exercised": true,
        "case_count": 2
      },
      {
        "id": "invalid-domain",
        "description": "Invalid inputs",
        "exercised": true,
        "case_count": 6
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "ASTM B258-18(2026): unrounded geometric progression (primary) + Table 1 standard nominals (pinned dataset)"
      },
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "ASTM B258-18(2026) Table 1 SI/inch-pound standard nominals (pinned dataset; not formula)",
        "engine": {
          "name": "awg-astm-b258-table1",
          "independent_of_iut": true,
          "table_sha256": "74ab3dc5e65e9197bd4fee71381e86c81c9893fde763dacc7780e06eaf3eb9df"
        }
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Separate-module AWG formula oracle — unrounded geometric progression (same V8 binary64 as IUT)",
        "engine": {
          "name": "awg-to-mm-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same O2 module backs ≤2 ULP formula diameter/area comparison vs IUT",
        "engine": {
          "name": "awg-to-mm-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      }
    ]
  },
  "links": {
    "legacy_evidence": "https://www.calculatorx.com/evidence/electrical.awg_to_mm/1.5.0.json",
    "evidence_page": "https://www.calculatorx.com/evidence/electrical.awg_to_mm/1.5.0",
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