Wire Ampacity

Ampacity by gauge, conductor material, insulation rating, ambient.

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Formula and source

Ampacity selection from NEC 310.16 (0–2000 V), 75°C termination column by default; ambient correction per NEC 310.15(B)(1) and adjustment for >3 CCCs per NEC 310.15(C)(1).

NEC 2023 (NFPA 70).

Audience

This tile is built for electricians and the adjacent professions in the Electrical group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.