Low-Voltage Variable Frequency Drives
P1 batch 4: hazardous-location installations, document confidentiality and AI use, generator paralleling switchgear, interrupter switchgear, medium-voltage drives and metal-enclosed bus now owned; bare-text mentions re-pointed to the new standards
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in Low-Voltage Variable Frequency Drives.
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title: Low-Voltage Variable Frequency Drives
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description: >
When to use: Individually mounted, enclosed pulse-width-modulated (PWM) variable frequency drives rated 600 V and below, specified under the electrical division for speed control of three-phase AC induction and permanent-magnet motors in non-HVAC applications — process pumps and fans, compressors, conveyors, mixers, water and wastewater treatment, and general industrial, institutional, and municipal motor loads. Covers fractional through 500 HP, wall- and floor-mount construction, NEMA 1 through 4X enclosures, indoor and outdoor service, variable- and constant-torque duty, input protection, harmonic mitigation, bypass, network communication, output filtering, and acceptance testing.
− Not intended for: HVAC fan and pump drives specified under the mechanical division (see [[sync/hvac-variable-frequency-drives]]); VFD units furnished as plug-in bucket contents in a motor control center assembly (see [[sync/motor-control-centers]]); medium-voltage drives above 600 V; drives integral to factory-packaged process equipment governed by their equipment specification; motor-circuit and output conductors (see [[sync/conductors-and-cables]]); and the feeder or branch-circuit panelboard upstream of the drive (see [[sync/panelboards]]).
+ Not intended for: HVAC fan and pump drives specified under the mechanical division (see [[sync/hvac-variable-frequency-drives]]); VFD units furnished as plug-in bucket contents in a motor control center assembly (see [[sync/motor-control-centers]]); medium-voltage drives above 600 V ([[sync/medium-voltage-drives]]); drives integral to factory-packaged process equipment governed by their equipment specification; motor-circuit and output conductors (see [[sync/conductors-and-cables]]); and the feeder or branch-circuit panelboard upstream of the drive (see [[sync/panelboards]]).
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## VFD units furnished as plug-in bucket contents within a motor control center assembly are excluded; the MCC assembly, bus structure, and compartment construction are governed by [[sync/motor-control-centers]], which defers drive performance back to this Standard. {note}
−## Medium-voltage drives operating above 600 V are excluded; they fall outside the UL 61800-5-1 low-voltage listing and require a separate medium-voltage drive specification. {note}
+## Medium-voltage drives operating above 600 V are excluded; they fall outside the UL 61800-5-1 low-voltage listing and are specified under [[sync/medium-voltage-drives]]. {note}
## Drives integral to factory-packaged process equipment — packaged pump skids, chillers, and compressor packages — are excluded and are governed by the respective equipment specification. {note}
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- Input fuses (each rating)
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