Public evidence

electrical.va_to_kva

Machine-checked verification for calculation version 1.3.1 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Pure scale; a=0 soft→0

Declared partition coverage: PASS · 2/2 declared partitions (va-kva, invalid-domain)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 4/4 property · digest f5a880d901ee

Verification

Legacy regression suite: 15/15 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (15/15 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 1.3.1 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 1.3.1. CVP 1.0.0-proposed. 1/1 golden · 2/2 CVP boundary · 2/2 invalid · 4/4 property · 2/2 metamorphic · 1/1 cross-interface · 6/6 CVP contract. digest f5a880d901ee.

Golden (oracle-backed) 1 / 1
CVP boundary 2 / 2
Invalid input 2 / 2
Property 4 / 4
Metamorphic 2 / 2
Cross-interface 1 / 1
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
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 sha256:69bf796ff3104af6e5db9d211011e25e66573e4fe5a531ea71d36844995c867b

Input schema sha256:c4b09156fc5adbf37a96f7327c4a7ba5c61c66d6f7cfcbf81ea6f4d122eb1141 · Output schema sha256:3c4486fcc884dd9d86023cab517609a99601c70ea59adb4a522ef466cbae1548 · 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: va-to-kva
Engine: scale
Engine build: 2026-09-10
Evidence core: 2026-09-10T22:48:17.762Z
Rendered: 2026-11-10T05:18:41.689Z
Last reviewed: —

Assumptions

Same quantity; metric kilo prefix only

Limitations

Not a watts/kW conversion — power factor is not used
Physical use assumes non-negative apparent power

Sources

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

IEC 60050 — International Electrotechnical Vocabulary — Apparent power (IEV 131-11-41)
Supports: VA and kVA name the same quantity (apparent power) at different scale; unit volt-ampere (VA)
BIPM SI Brochure (9th edition, version 4.01) — SI prefixes — kilo (k) = 10³ · 2026-06 · DOI
Supports: 1 kVA = 1000 VA metric scaling
NIST Guide to the SI (SP 811) — Prefix usage for derived units
Supports: kVA and VA differ by factor of 1000 only

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.