This site offers many simple-to-use calculators and wire ampacity charts to aide you in properly sizing wire and conduit in compliance with the NEC. Determine transformer size by calculating the total load connected to the transformer, and then multiply this value by 1. AWG (US): American Wire Gauge - Standard in USA/Canada (14, 12, 10, 8, 6, 4, etc. ) mm² (Metric): Cross-sectional area in square millimeters. Free, practical electrical calculators for electricians, engineers, students, and technical teams working with U. Calculate proper wire gauge, voltage drop, and ampacity for safe electrical installations.
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