MOTORS · REFERENCE GUIDE
Motor terminals marking
Reference guide to motor terminals marking for electricians: 3 checks to work through, the limits that apply and when to verify against the NEC and maker data.
US (NEC) only · NFPA 70 / NEC — locally adopted editionDefaults are US values. Verify the locally adopted NEC edition and project data.Official reference ↗
REFERENCE GUIDE
Before starting
- IEC winding labels commonly use U, V and W; NEMA lead conventions commonly use T labels.
- Do not translate labels into physical wiring without the manufacturer diagram.
- Record winding identity, supply rating and the equipment grounding conductor separately.
This is a reference guide, not a sizing calculator or installation approval.
Method & assumptions
Reference workflow — project-specific verified data required
This is a reference guide, not a sizing calculator or installation approval.
Results do not check every aspect of an electrical installation. The calculators follow US (NEC) practice only; a regional preset changes defaults such as voltage and units, and no result certifies NEC compliance.
Sources and validation →Estimating and invoicing tool
Ampxa is developing an estimating and invoicing application for electrical contractors. The list below receives notice when it opens.