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Electrical Motor Locked Rotor Indicating Code Letters Indicating locked rotor code letters for electrical motors Sponsored Links HYPERLINK "" NEMA - The National Electrical Manufacturer's Association - who sets the design standards for motors, has established a NEMA Code letter designation to classify motors by the ratio of locked rotor KVA per horsepower.NEMACode LetterKVA/HPwith locked rotorApproximate Mid-Range ValueA0-3.141.6B3.15-3.553.3C3.55-3.993.8D4.0-4.494.3E4.5-4.994.7F5.0-5.595.3G5.6-6.295.9H6.3-7.096.7J7.1-7.997.5K8.0-8.998.5L9.0-9.999.5M10.0-11.1910.6N11.2-12.4911.8P12.5-13.9913.2R14.0-15.9915.0S16.0-17.99?T18.0-19.99?U20.0-22.39?V22.4-and up?The starting KVA required by a motor starting at full voltage is determined from the nameplate on the motor or from the manufacturer.In general it is accepted that small motors requires higher starting KVA than larger motors. Standard 3 phase motors often have these locked rotor codes:less than 1 hp: Locked Rotor Code L, 9.0-9.99 KVA1 1/2 to 2 hp: Locked Rotor Code L or M, 9.0-11.193 hp : Locked Rotor Code K, 8.0-8.995 hp : Locked Rotor Code J, 7.1-7.997.5 to 10 hp : Locked Rotor Code H, 6.3-7.09more than 15 hp : Locked Rotor Code G, 5.6-6.29? How To Read a Marathon Model Number off the NameplateExample of Marathon Fractional Model Number: 8PE48A11O787AP R1308PE48A11O787APR130123456710111213Example of Marathon Integral Model Number: 2QA215TBDRA7076AL L R1162QA215TBDORA7076ALLR11612345678910111213Date Code - Year Motor was manufactured.Thermal Protection (not always present in every Marathon model number)Date Code - Month Motor was manufactured.NEMA Frame SizeElectrical TypeRPM or Speed (Fractional Motors only)EnclosureFrame Construction (Integral Motors only)Style Letter indicating redesignSequence NumberRevision Letters (1 letter for Fractional, 2 letters for Integral)Manufacturing CodeModification Code (only present on nameplates of motors that have been modified through Marathon's MOD CENTRAL) ................
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