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: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· Pure scale; a=0 soft→0 · Protocol · Schema · Production report

Declared partition coverage: PASS · 2/2 declared partitions (va-kva, invalid-domain)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed
CVP identity: 4/4 property · digest 93480652bc49

Verification

Legacy regression suite: 15/15 calculation tests · Production surface contract 4/4

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. Calculation version 1.3.1. CVP 1.0.0-proposed. 1/1 golden · 2/2 CVP boundary · 2/2 invalid · 4/4 property · 1/1 cross-interface · 1/1 CVP contract. digest 93480652bc49.

Golden (oracle-backed) 1 / 1
CVP boundary 2 / 2
Invalid input 2 / 2
Property 4 / 4
Cross-interface 1 / 1
CVP contract 1 / 1
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 valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input 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: 2026-09-16T22:03:43.705Z
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

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`2760VA`	golden	pass	Expected 2.76 · Actual 2.7600000000000002
`1000VA`	golden	pass	Expected 1 · Actual 1
`1kVA-to-VA`	golden	pass	Expected 1000 · Actual 1000
`2500VA`	golden	pass	Expected 2.5 · Actual 2.5
`linear-2x`	golden	pass	Expected 5 · Actual 5
`soft-zero-va`	golden	pass	Expected 0 · Actual 0
`soft-zero-kva`	golden	pass	Expected 0 · Actual 0
`5kVA-to-VA`	golden	pass	Expected 5000 · Actual 5000
`roundtrip-kva-back`	golden	pass	Expected 2500 · Actual 2500
`boundary-missing-a`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-nonfinite-a`	boundary	pass	Expected INVALID_NUMBER · Actual INVALID_NUMBER
`property-scale`	property	pass	a·factor = 2.76
`property-linear`	property	pass	scale linear in a
`property-roundtrip`	property	pass	VA↔kVA round-trip
`property-zero`	property	pass	0 scales to 0