Spec

Code snippets

curl "https://api.oanor.com/voltagedrop-api/v1/meta" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/voltagedrop-api/v1/meta", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/voltagedrop-api/v1/meta");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/voltagedrop-api/v1/meta",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "notes": "Current in A, length (one-way) in m, area in mm², voltage in V. Resistivity ρ at 20°C: copper 0.0172, aluminium 0.0282 Ω·mm²/m. Resistive model only — line reactance and temperature derating are not included.",
        "service": "voltagedrop-api",
        "formulae": {
            "power_loss": "P = N·I²·R,  N = 2 or 3 conductors",
            "resistance": "R = ρ·L/A  (one-way)",
            "voltage_drop": "Vd = k·I·R,  k = 2 (single-phase), √3 (three-phase)"
        },
        "endpoints": {
            "GET /v1/drop": "Voltage drop, percentage and voltage at the load over a cable run.",
            "GET /v1/meta": "This document.",
            "GET /v1/power": "Power dissipated in the cable and the resulting efficiency.",
            "GET /v1/sizing": "Smallest standard conductor cross-section for an allowable percentage drop."
        },
        "description": "Cable voltage-drop and conductor-sizing calculator: voltage drop over a run, conductor cross-section for an allowable drop, and cable power loss for copper and aluminium."
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:26.964Z",
        "request_id": "d3c019f9-092e-4893-b867-bd73e38ab1e5"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}