Nema Mg1-32 | Amp- 33 ((free))

Within MG1, Parts 32 and 33 address two distinct but equally critical threats to modern AC motors: and shaft voltage damage to bearings .

It addresses how a motor must perform at various speed ranges, particularly ensuring that compliance with torque and efficiency requirements is met at the rated voltage. It defines a "Motor of Adjustable Speed" nema mg1-32 amp- 33

| Myth | Fact | | :--- | :--- | | "AMP-33 is a different standard from MG1-33." | No. "AMP-33" is a user-derived term for MG1 Part 33. | | "MG1-32 covers bearings, and AMP-33 covers insulation." | False. MG1-32 = insulation; MG1-33 = bearings. | | "All NEMA motors automatically comply with both sections." | False. Standard motors (often called "General Purpose") do not comply. You must specifically buy or VFD-Duty motors. | | "A line reactor or dV/dt filter eliminates need for MG1-33." | False. Filters reduce peak voltage (helping MG1-32) but do not eliminate common-mode voltage (MG1-33). | Within MG1, Parts 32 and 33 address two

The subject refers to the NEMA MG 1-2021 standard, specifically Section IV, Parts 32 and 33 "AMP-33" is a user-derived term for MG1 Part 33