{ "capability_id": "electrical.apparent_power", "tool_id": "amps-to-va", "engine": "amps-va", "calculation_version": "1.4.3", "generated_at": "2026-11-10T05:18:41.661Z", "engine_build": "2026-09-10", "test_count": 36, "passed": 36, "failed": 0, "tests_summary": { "golden": { "passed": 9, "total": 9 }, "boundary": { "passed": 13, "total": 13 }, "property": { "passed": 14, "total": 14 } }, "engine_tested": true, "expert_reviewed": false, "internally_reviewed": false, "review_kind": null, "source_checked": true, "reviewed_by": null, "reviewer_role": null, "last_reviewed": null, "expert_review": { "status": "optional_not_performed", "reviewer": null, "scope": [ "formula", "input semantics", "assumptions", "limitations", "sources", "tests" ], "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance." }, "internal_review": { "status": "not_applicable", "reviewer": null }, "page": "https://www.calculatorx.com/calc/electric/amps-to-va", "api": "https://www.calculatorx.com/api/v1/calc/amps-to-va", "schema_input": "https://www.calculatorx.com/schemas/electrical.apparent_power.input.json", "schema_output": "https://www.calculatorx.com/schemas/electrical.apparent_power.output.json", "assumptions": [ "AC steady-state with RMS voltage and current magnitudes.", "Three-phase mode is balanced sinusoidal AC using line-to-line RMS voltage, where V_LL = √3 V_LN and line currents are equal. IEEE 1459 covers a wider set of conditions; this calculator does not.", "Total power factor λ is not applied to VA/kVA results." ], "limitations": [ "Not for DC systems", "Not for unbalanced or nonsinusoidal three-phase; √3 formula assumes balanced sinusoidal V_LL = √3 V_LN and equal line currents", "Not for line-to-neutral three-phase mode", "Not for equipment protection or conductor sizing", "When power_factor is supplied, REST/MCP include derived.estimated_real_power; omitted when λ is absent" ], "boundary_conditions": [ "Missing or non-positive voltage returns an error (UI and API); never a fake 0 A / 0 VA", "Power factor outside [0, 1] is rejected when provided; not silently ignored. λ=0 is accepted (P_est=0 when S>0).", "Negative primary (current or VA) is rejected", "Overflow to Infinity or NaN is rejected as NON_FINITE_RESULT; never returned as a success result" ], "sources": [ { "title": "IEC 60050 — International Electrotechnical Vocabulary", "section": "Apparent power (IEV 131-11-41)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-41", "supports": "S = U × I definition of apparent power; unit volt-ampere (VA)", "kind": "standard", "accessed": "2026-09-04", "clause": "IEV 131-11-41" }, { "title": "IEC 60050 — International Electrotechnical Vocabulary", "section": "Power factor (IEV 131-11-46)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-46", "supports": "λ = |P| / S, so λ = 0 when P = 0 and S > 0; optional page/API estimate P_est = S × λ_entered uses this definition", "kind": "standard", "accessed": "2026-09-04", "clause": "IEV 131-11-46" }, { "title": "IEEE Std 1459-2025", "section": "Definitions for electric power measurement under sinusoidal, nonsinusoidal, balanced, or unbalanced conditions", "url": "https://standards.ieee.org/ieee/1459/7578/", "supports": "IEEE 1459 covers sinusoidal, nonsinusoidal, balanced, and unbalanced conditions. This calculator implements only the balanced sinusoidal three-phase model S = √3 × V_L-L × I_L (V_LL = √3 V_LN, equal line currents).", "kind": "standard", "accessed": "2026-09-04", "publisher": "IEEE", "published": "2025-05-16", "errata_checked": true }, { "title": "BIPM SI Brochure (9th edition, version 4.01)", "section": "SI base and derived units for ampere, volt, and power", "url": "https://www.bipm.org/en/publications/si-brochure", "supports": "V, A, W, and VA unit relationships", "kind": "reference", "accessed": "2026-09-04", "published": "2026-06", "doi": "https://doi.org/10.59161/AUEZ1291" } ], "methods": [], "fingerprint": "sha256:8f1fe71ef5ac163067373cca83fd06606a09cf26222e4f7549938786262e71d7", "tier": "engine_tested", "verification": { "tests": { "passed": 36, "total": 36, "golden": 9, "boundary": 13, "property": 14 }, "contract_checks": { "passed": 6, "total": 6 } }, "evidence_core_generated_at": "2026-09-10T22:48:17.762Z", "rendered_at": "2026-11-10T05:18:41.661Z", "release_integrity": { "status": "verified", "scope": "workspace", "production_attestation_required": true, "calculation_version": "1.4.3", "artifacts": { "engine": "1.4.3", "page": "1.4.3", "capability": "1.4.3", "evidence": "1.4.3", "input_schema": "1.4.3", "output_schema": "1.4.3", "mcp_contract": "1.4.3" }, "digests": { "input_schema_sha256": "5bf23cb0b374dc943d075d420a742cbbfabfe8dd5b7f4a26a608ec186c0b9835", "output_schema_sha256": "550be97c601f18e5c860c9a6aaf3d5f117474eda14f4121568ae369861f1b19c", "evidence_sha256": "5a2953f6e477fe8209fcf7c24d5e04f38452fda1a88096f95fd879301bc6aec7", "evidence_core_sha256": "5a2953f6e477fe8209fcf7c24d5e04f38452fda1a88096f95fd879301bc6aec7", "capability_sha256": "759a302daeeb7c5d5a1fcf4cd35dde92fe57a341d4c24e8fc570487a7494f20e", "engine_sha256": "c6ebd8436f08b413e1ac6317b2d48550f2e6639a90dff254244e3aa562158b8d", "mcp_contract_sha256": "eb3e39ad4a95ed263415b4932f185d5edfe00a2403267b7c5ed5f718d1ff6da3" }, "contract_checks": { "total": 6, "passed": 6, "failed": 0, "items": [ { "id": "release-artifacts-aligned", "status": "pass", "detail": "1.4.3" }, { "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" } }