
Electrical Reference Card
One page. Voltage drop lengths, breaker and wire pairing, motor FLC.
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BuyNEC 430.24 feeder ampacity and NEC 430.53(C) group OCPD for two or more motors sharing a feeder or branch.

One page. Voltage drop lengths, breaker and wire pairing, motor FLC.
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15 pages. Ampacity, corrections, voltage drop, motor circuits, conduit fill.
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Quote electrical work and flag panel headroom before you price it.
Excel or Google Sheets. Best on a computer.
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Card, 15-page guide and the estimator workbook. All six files.
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Measure running current on multi-motor feeders during commissioning.
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Verify voltage balance at motor terminals before blaming the heater.
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High-current checks on larger grouped feeders.
View on Amazon →NEC 430.24 feeder conductors: sum of all motor table FLAs + 25% of the highest-rated motor FLA. NEC 430.53(C) group branch OCPD: Table 430.52 allowance for the largest motor plus the FLA of every other motor on the circuit — device rating must not exceed that ceiling. Each motor still needs its own overload (430.32).
Full walkthrough: Grouped Motor Circuit Sizing Guide. Single-motor chart: Motor Circuit Sizing Chart.