Shop-floor guides
Written for the person who has to buy the part or fit it: what the numbers mean, how to choose, and the mistakes that cost a second order. Each guide ends at the printable sheet you'll want on the wall.
Guides
How to choose an electric motorLoad, power, speed, supply, starting, enclosure and IE class — seven steps to an order line, with a worked pump example.How to read a motor nameplateEvery field on an IEC or NEMA plate: kW/HP, volts, amps, rpm, frame, IP, insulation class, duty and service factor.Tap drill size charts explainedWhy the tap drill is smaller than the bolt, where the chart numbers come from, and when to go a size up.
Motor sheets
Print them, or download them for Excel.
IE3/IE4 Motor Compliance Chart (EU 2026)Which IE class a new motor must be in the EU, whether an old IE1 or IE2 motor may keep running or be rewound, and what an upgrade saves — with a checker for your nameplate.IEC Motor Frame ChartEvery IEC frame from 63 to 355: shaft height, foot hole spacing, shaft size and the kW normally built on it, plus B3/B5/B14.NEMA Motor Frame ChartNEMA T frames from 56 to 449T with shaft height, foot holes, shaft size and typical HP — and what C, TS and JM mean.Motor Full-Load Current ChartFull-load amps for three-phase motors at 208 to 575 V with the copper size for each, and typical IEC amps at 400 V.Motor Efficiency Class ChartMinimum efficiency for IE1 to IE4 at every standard rating, and which class the EU lets you buy now.
Workbooks
Excel files to keep and fill in, not just print.
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The Shop Sheet, once a month: one new printable chart, and one standards gotcha that catches people out — the kind of wrong number a forum thread or an AI answer gives with total confidence. No sales emails.