Arc Flash Incident Energy Estimator (simplified IEEE 1584-style) implementation

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

t7-120

Effect

Computation or source lookup only

Input and validation requirements

The zero-working-distance vector produces an undefined division, and zero clearing time produces a mathematically zero but physically invalid estimate. The specification also omits the actual coefficient tables and unit/sign conventions needed for a reproducible IEEE 1584 calculation.

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": {
    "system_voltage_V": 480,
    "bolted_fault_current_kA": 10,
    "working_distance_in": 18,
    "clearing_time_s": 0.081,
    "equipment_class": "low_voltage_enclosed",
    "calculation_status": "provisional_baseline_only"
  },
  "expected_outputs": {
    "provisional_incident_energy_cal_cm2": 1.2,
    "provisional_ppe_bin": "Category 1 threshold, exactly 1.2 cal/cm²"
  },
  "reference_data": {
    "cal_to_joule": {
      "value": 4.184,
      "unit": "J/cal",
      "source_convention": "widely tabulated standard value; thermochemical calorie"
    },
    "pけppe_threshold_1": {
      "value": 1.2,
      "unit": "cal/cm²",
      "source_convention": "NFPA 70E threshold convention, widely tabulated standard value"
    },
    "pfe_ppe_category_1_upper": {
      "value": 4,
      "unit": "cal/cm²",
      "source_convention": "NFPA 70E arc-rated PPE convention, widely tabulated standard value"
    }
  },
  "working": "Convert voltage: 480 V ÷ 1000 = 0.48 kV. Numerator = 1000 × 0.48 × 10 × 0.081 = 388.8. Distance squared = 18² = 324 in². Energy = 388.8 ÷ 324 = 1.200 cal/cm². This lands exactly on the widely tabulated 1.2 cal/cm² threshold."
}

Other records

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