Source: https://guthlabs.ai/docs/instruments/wire-gauge-awg-swg-diameter-area-converter/implementation/

instrument implementation / implementation-contract

# Wire Gauge (AWG/SWG) ↔ Diameter/Area Converter implementation

A source-bound implementation contract for Wire Gauge (AWG/SWG) ↔ Diameter/Area Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t7-060

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not define rejection behavior for zero diameter, does not identify the exact valid AWG range, and does not require an explicit AWG-versus-SWG selector or diameter unit. These omissions permit undefined outputs and materially different numeric results.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "standard": "AWG",
    "gauge": 36,
    "material": "annealed copper",
    "temperature_C": 20,
    "requested_resistance_lengths": [
      "1 km",
      "1000 ft"
    ]
  },
  "expected_outputs": {
    "diameter_mm": 0.127,
    "area_mm2": 0.012667687,
    "resistance_ohm_per_km": 1326.21,
    "resistance_ohm_per_1000ft": 404.23
  },
  "reference_data": {
    "awg_row": {
      "gauge": 36,
      "diameter_mm": 0.127,
      "source_convention": "AWG standard, widely tabulated standard value"
    },
    "copper_resistivity_ohm_m_20C": 1.68e-8,
    "source_convention_resistivity": "widely tabulated standard value for copper at 20 °C",
    "pi": 3.141592653589793,
    "source_convention_pi": "mathematical constant",
    "metres_per_1000ft": 304.8,
    "source_convention_length": "exact SI/international-foot conversion"
  },
  "working": "d=0.127 mm (the exact AWG-36 table entry). A=πd²/4=3.141592653589793×(0.127²)/4=3.141592653589793×0.016129/4=0.012667687 mm². Convert area: A=0.012667687×10^-6=1.2667687×10^-8 m². R/km=ρL/A=(1.68×10^-8 Ω·m×1000 m)/(1.2667687×10^-8 m²)=1326.21 Ω/km. R/1000 ft=(1.68×10^-8×304.8)/(1.2667687×10^-8)=404.23 Ω/1000 ft."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/wire-gauge-awg-swg-diameter-area-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/wire-gauge-awg-swg-diameter-area-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/wire-gauge-awg-swg-diameter-area-converter/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche7/tranche7-results.json`