ampacity

ABYC E-11 derived reference data for sizing DC wiring on boats and RVs, published as language-neutral JSON. No code — just the tables every implementation needs:

• data/e11.json — AWG circular-mil areas; allowable amperage by insulation temperature rating, outside engine spaces (E-11 Table 6A); engine-space correction factors; DC bundling derates; the copper voltage-drop constant (K = 10.75); standard fuse ratings.
• fixtures/abyc-fixtures.json — spot-check cases verified against the ABYC published 3%/10% voltage-drop lookup tables and Table 6A. An implementation in any language that consumes this data should reproduce these outputs exactly.

Provenance

Ampacity values, correction factors, and derates are transcribed from ABYC E-11 Table 6A as republished with ABYC's permission at https://boathowto.com/wiresize/wiresize_tables_abyc.pdf. Provenance is also embedded in the JSON itself under provenance.

Consumers

• wire-wright — JavaScript library + CLI.

This package is data-only so ports (Python, Kotlin, anything) can share one source of truth and one fixture set instead of re-transcribing tables.

License

MIT. ABYC table values used per the republication permission noted above; ABYC is not affiliated with this project and has not endorsed it.