{ "protocol": { "name": "CVP", "version": "1.0.0-proposed" }, "document_status": "proposed", "calculator": { "id": "voltage-drop", "version": "1.5.2", "title": "Voltage Drop Calculator", "formula_family": "conductor-voltage-drop", "capability_id": "electrical.voltage_drop", "verification_revision": "2026-09-11.schema-coverage-u" }, "profile": "engineering", "status": "VERIFIED", "runner": { "name": "cvp-runner", "version": "1.0.0" }, "environment": { "runtime": "node", "runtime_version": "22.23.2", "numeric_model": "IEEE-754 binary64", "os": "linux" }, "suite": { "id": "voltage-drop", "version": "1.5.2", "uri": "https://www.calculatorx.com/evidence/electrical.voltage_drop/1.5.2.json", "verification_revision": "2026-09-11.schema-coverage-u" }, "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": "IEC 60364-5-52:2009+AMD1:2024", "kind": "standard", "reference": "Clause 525 / Annex G — Voltage drop in consumers' installations", "url": "https://webstore.iec.ch/en/publication/103734" }, { "label": "IEC 60050 — International Electrotechnical Vocabulary", "kind": "standard", "reference": "Voltage drop (IEV 151-15-08)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=151-15-08" }, { "label": "IEC 60050 — International Electrotechnical Vocabulary", "kind": "standard", "reference": "Resistance (IEV 131-12-04)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-12-04" }, { "label": "NFPA 70 — National Electrical Code (NEC)", "kind": "standard", "reference": "Informational notes on voltage-drop limits for feeders and branch circuits", "url": "https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=70" }, { "label": "NIST Guide to the SI (SP 811)", "kind": "other", "reference": "Volt, ampere, ohm, and metre", "url": "https://www.nist.gov/pml/special-publication-811" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Conductor resistive voltage drop (DC/1φ / 3φ)" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module voltage-drop oracle — same V8 binary64 as IUT", "engine": { "name": "voltage-drop-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP V_drop comparison vs IUT", "engine": { "name": "voltage-drop-reference", "precision_bits": 53, "independent_of_iut": true } } ], "notes": "Golden expected values use a separate O2 module (not IUT transcription). O2 shares Node/V8 binary64 with the IUT unless noted otherwise." }, "controls": { "CVP-PROV-01": { "result": "PASS", "applicability": "required", "notes": "Sources present on evidence" }, "CVP-MODEL-01": { "result": "PASS", "applicability": "required", "notes": "Nominal DC/1φ (×2) and balanced 3φ (×√3) model verified; optional uncertainty composition verified by dedicated golden, boundary, and property tests." }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Resistance-only / PF≈1 estimate — not IEC 60364-5-52 Annex G impedance model" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "A, m, Ω/km; optional V_system" }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "12/12 legacy golden; 4/4 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "11/11 CVP boundary · 12/12 legacy Evidence boundary" }, "CVP-INV-01": { "result": "PASS", "applicability": "required", "notes": "10 invalid-domain cases" }, "CVP-NUM-01": { "result": "PASS", "applicability": "required", "notes": "max_error_observed_ulp=0; policy declared a priori" }, "CVP-COV-01": { "result": "PASS", "applicability": "required", "notes": "5/5 declared partitions (dc, three, with-V_system, with-uncertainty, invalid-domain) · 12 legacy golden / 11 CVP boundary unique cases · 10 Evidence invalid-input (may overlap boundary)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "6/6 contract checks" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine voltage-drop; 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 @ 2026-09-11T06:03:54.464Z · live site-wide report stale @ 2026-09-11T06:03:56.550Z (3 other capabilities) · local checks pass · attestation_id=a87334aa9ed4564c6f0875d2943e364ac942bb7b7edf05fb204d0e9d434134e2 · This calculator CURRENT · Bound attestation PASS @ 2026-09-11T06:03:54.464Z · Live site report STALE (3 capabilities; 153 remain CURRENT) @ 2026-09-11T06:03:56.550Z · Public schema 1.5.2 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.5.2 · 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=75eb658f5a2a7986aa44ee2dadf15a3e19122fe7dcb44ca0ac48573f142c77ae · verified_at=2026-09-11T05:48:32.249Z · evidence_attested_at=2026-09-11T03:26:54.926Z · last_confirmed_current_at=2026-09-11T06:03:54.464Z · rendered_at=2026-09-11T06:03:56.586Z · binds=evidence_digest" }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Voltage from I·R" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "14/14 property" }, "CVP-META-01": { "result": "PASS", "applicability": "applicable", "notes": "4/4 metamorphic" }, "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." }, "CVP-ORACLE-01": { "result": "SKIP", "applicability": "higher_assurance", "notes": "O2 present; O3 not required this wave" }, "CVP-EXP-01": { "result": "SKIP", "applicability": "optional", "notes": "expert_reviewed=false" } }, "tests": { "golden": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "g-dc", "g-3ph", "g-pct", "g-unc" ] }, "boundary": { "passed": 11, "total": 11, "failed": 0, "case_ids": [ "error-neg-Rkm", "error-neg-I", "error-missing-length", "boundary-neg-I", "boundary-neg-length", "boundary-missing-I", "boundary-unc-I-length", "boundary-unc-k-without-u", "boundary-zero-Vsys", "boundary-neg-Vsys", "boundary-sys-230" ] }, "invalid": { "passed": 10, "total": 10, "failed": 0, "case_ids": [ "error-neg-Rkm", "error-neg-I", "error-missing-length", "error-invalid-mode", "boundary-neg-I", "boundary-neg-length", "boundary-missing-I", "boundary-unc-k-without-u", "boundary-zero-Vsys", "boundary-neg-Vsys" ] }, "property": { "passed": 14, "total": 14, "failed": 0, "case_ids": [ "property-dc-drop", "property-linear-current", "property-linear-length", "property-3phi-drop", "property-linear-Rkm", "property-dc-vs-3phi-factor", "property-linear-grid-IL", "property-uncertainty-compose", "property-no-unc-omit", "property-percent-drop", "property-load-voltage", "property-3phi-ll-percent", "property-dc-loss", "property-3phi-loss" ], "kind": "fixed" }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "meta-scale-I", "meta-scale-L", "meta-scale-R", "meta-dc-vs-3phi" ], "definition_ids": [ "homogeneous-current", "homogeneous-length", "homogeneous-resistance", "dc-three-factor" ] }, "contract": { "passed": 6, "total": 6, "failed": 0 }, "cross_interface": { "passed": 1, "total": 1, "failed": 0, "case_ids": [ "iface-dc" ] } }, "coverage": { "partitions": [ { "id": "dc", "description": "DC / 1φ", "exercised": true, "case_count": 32 }, { "id": "three", "description": "Three-phase", "exercised": true, "case_count": 5 }, { "id": "with-V_system", "description": "With system voltage", "exercised": true, "case_count": 3 }, { "id": "with-uncertainty", "description": "With input uncertainty (u_*)", "exercised": true, "case_count": 3 }, { "id": "invalid-domain", "description": "Invalid inputs", "exercised": true, "case_count": 10 } ] }, "numerical": { "representation": "IEEE-754 binary64", "tolerance": { "type": "ulp", "value": 2, "rationale": "Resistive voltage drop; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-dc", "reference": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5 }, "actual": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-3ph", "reference": { "V_drop": 34.64101615137755, "R_one_way": 0.4, "P_loss": 3000 }, "actual": { "V_drop": 34.64101615137755, "R_one_way": 0.4, "P_loss": 3000 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-pct", "reference": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5, "percent_drop": 4.3478260869565215, "V_load": 220 }, "actual": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5, "percent_drop": 4.3478260869565215, "V_load": 220 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-unc", "reference": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5 }, "actual": { "V_drop": 10, "R_one_way": 0.25, "P_loss": 200, "R_loop": 0.5, "uncertainty": { "y": 10, "u_c": 0.6403124237432849, "U": 1.2806248474865698, "k": 2, "k_source": "user", "unit": "V", "u_rel": 0.06403124237432849, "mode": "sensitivity", "contributions": [ { "i": 0, "label": "I", "c": 0.5, "u": 1, "variance": 0.25, "percent": 60.975609756097555, "type": null, "nu": null }, { "i": 1, "label": "length_m", "c": 0.2, "u": 2, "variance": 0.16000000000000003, "percent": 39.024390243902445, "type": null, "nu": null } ], "largest": { "i": 0, "label": "I", "percent": 60.975609756097555 }, "reported": { "u_c": 0.64, "y": 10, "significant_digits": 2, "k": 2, "U": 1.3 }, "capability_id": "engineering.uncertainty.propagate" } }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "meta-scale-I", "reference": 2, "actual": 2, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "actual": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "error_ulp": 0 }, "follow": { "reference": { "V_drop": 20, "R_one_way": 0.5, "P_loss": 400, "R_loop": 1 }, "actual": { "V_drop": 20, "R_one_way": 0.5, "P_loss": 400, "R_loop": 1 }, "error_ulp": 0 }, "relation": { "reference": 2, "actual": 2, "error_ulp": 0 } } }, { "id": "meta-scale-L", "reference": 2, "actual": 2, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "actual": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "error_ulp": 0 }, "follow": { "reference": { "V_drop": 20, "R_one_way": 1, "P_loss": 200, "R_loop": 2 }, "actual": { "V_drop": 20, "R_one_way": 1, "P_loss": 200, "R_loop": 2 }, "error_ulp": 0 }, "relation": { "reference": 2, "actual": 2, "error_ulp": 0 } } }, { "id": "meta-scale-R", "reference": 2, "actual": 2, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "actual": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "error_ulp": 0 }, "follow": { "reference": { "V_drop": 20, "R_one_way": 1, "P_loss": 200, "R_loop": 2 }, "actual": { "V_drop": 20, "R_one_way": 1, "P_loss": 200, "R_loop": 2 }, "error_ulp": 0 }, "relation": { "reference": 2, "actual": 2, "error_ulp": 0 } } }, { "id": "meta-dc-vs-3phi", "reference": 1.1547005383792517, "actual": 1.1547005383792517, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "actual": { "V_drop": 10, "R_one_way": 0.5, "P_loss": 100, "R_loop": 1 }, "error_ulp": 0 }, "follow": { "reference": { "V_drop": 8.660254037844386, "R_one_way": 0.5, "P_loss": 150 }, "actual": { "V_drop": 8.660254037844386, "R_one_way": 0.5, "P_loss": 150 }, "error_ulp": 0 }, "relation": { "reference": 1.1547005383792517, "actual": 1.1547005383792517, "error_ulp": 0 } } } ] }, "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." }, "artifacts": { "evidence_bundle_sha256": "6f551f1e0a047f1f34e6721d840422a6507b735b8618c64afbb9162ae57a8c44", "evidence_digest": "e4ca53248b8baa9a3d79d6105b30bd58e95e360b8e1d0e7ce7ae32ad2c1145ff", "production_sha256": "75eb658f5a2a7986aa44ee2dadf15a3e19122fe7dcb44ca0ac48573f142c77ae", "attested_catalog_sha256": "dfecb6d8c9caa3b60d2fd537df9c1d72e0689bb5ea421456ca7507c4af2a7bf4", "production_checks": [ { "id": "electrical.voltage_drop:output-const", "status": "pass", "detail": "output const 1.5.2 vs capability 1.5.2", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:evidence-sha256", "status": "pass", "detail": "dca16a95a1f4", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:semantic-contract", "status": "pass", "detail": "38/38", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.5.2 vs origin 1.5.2", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.voltage_drop/1.5.2/2026-09-11.schema-coverage-u/engineering/e4ca53248b8b", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.voltage_drop:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.voltage_drop/1.5.2/2026-09-11.schema-coverage-u/engineering/e4ca53248b8b", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.voltage_drop:cvp-immutable-manifest-fetch", "status": "pass", "detail": "public=200 origin=200", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:cvp-immutable-manifest-sha256", "status": "pass", "detail": "e4ca53248b8b", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:cvp-latest-alias-matches-immutable", "status": "pass", "detail": "electrical.voltage_drop/1.5.2/2026-09-11.schema-coverage-u/engineering/e4ca53248b8b", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.voltage_drop:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.voltage_drop:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" } ], "digest_registry": { "digest_algorithm": "sha256", "canonicalization": "json-sorted-keys-utf8", "entries": [ { "name": "cvp_evidence_digest", "field": "artifacts.evidence_digest", "digest_scope": "cvp_verification_fingerprint_v2", "value": "e4ca53248b8baa9a3d79d6105b30bd58e95e360b8e1d0e7ce7ae32ad2c1145ff", "note": "CVP suite fingerprint; independent of Evidence generated_at" }, { "name": "artifact_evidence_sha256", "field": "release_integrity.digests.evidence_core_sha256", "digest_scope": "evidence_artifact_core", "value": "dca16a95a1f4871b6fffe3bf67f5cb19888580fec7eccd77f3e32e03b66ffcd1", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "dfecb6d8c9caa3b60d2fd537df9c1d72e0689bb5ea421456ca7507c4af2a7bf4", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] } }, "dependencies": [ { "name": "voltage-drop-engine", "version": "1.5.2" }, { "name": "voltage-drop-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "22.23.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "a87334aa9ed4564c6f0875d2943e364ac942bb7b7edf05fb204d0e9d434134e2", "attested_at": "2026-09-11T03:26:54.926Z", "last_confirmed_current_at": "2026-09-11T06:03:54.464Z", "site_attestation_current": false, "capability_attestation_current": true, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-09-11T06:03:54.464Z", "live_updated_at": "2026-09-11T06:03:56.550Z", "site_stale_capability_count": 3, "evidence_attested_at": "2026-09-11T03:26:54.926Z" }, "domain_review": { "status": "ABSENT", "spec_version": "1.5.2", "external_third_party": false, "independence": "internal" }, "timestamps": { "verified_at": "2026-09-11T05:48:32.249Z", "generated_at": "2026-09-11T05:48:32.249Z", "rendered_at": "2026-09-11T06:03:56.586Z", "notes": "verified_at/generated_at mark the first publication of this evidence_digest (suite verification). evidence_attested_at/attested_at is the first production bind of that 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 evidence_digest. Production attestation binds evidence_digest, not rendered_at. Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at." }, "links": { "legacy_evidence": "https://www.calculatorx.com/evidence/electrical.voltage_drop/1.5.2.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.voltage_drop/1.5.2", "calculator": "https://www.calculatorx.com/calc/wire/voltage-drop", "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json", "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0", "manifest": "https://www.calculatorx.com/evidence/electrical.voltage_drop/1.5.2.cvp.json", "manifest_immutable": "https://www.calculatorx.com/evidence/electrical.voltage_drop/1.5.2/2026-09-11.schema-coverage-u.cvp.json" } }