Chart

VFD motor lead length and output filter selection chart

Compare motor lead length, 575/600 V drive context, reflected wave risk, and output filter options.

Chart boundary

Does not select a VFD cable, approve motor insulation, calculate reflected wave voltage, or replace manufacturer limits.

filter selection bands

Cable length risk zones

The chart treats cable length as a risk trigger, not a universal filter rule.

Scopemotors and vfdsX-axismotor lead lengthY-axisfilter review tierReviewAnnualNext575/600 V VFD planning current calculator
Cable length risk zonesmotor lead lengthShort leadmanual limit checkReview zoneoutput reactor / dV/dtLong leaddV/dt / sine filter review
The chart treats cable length as a risk trigger, not a universal filter rule.
Short lead
manual limit check
Review zone
output reactor / dV/dt
Long lead
dV/dt / sine filter review
Line voltage575/600 V relevance

Canadian industrial systems can raise insulation stress.

Carrier frequencydrive setting

Switching frequency changes output stress.

Motor insulationinverter-duty?

Older motors need special review.

Decision reference

Show when a VFD-to-motor cable run should trigger output reactor, dV/dt filter, sine filter, or motor insulation review.

Reference basis: Eaton and ABB motor lead length guides plus Canadian 575/600 V dV/dt selection context.
ConditionChart readingNext checkBoundary
Short motor leadCheck manufacturer maximum without filterDrive manualNo length approval
Long 575/600 V leaddV/dt stress becomes a priorityOutput filter guideNo filter selection
Older motor insulationInsulation suitability may control riskMotor manufacturer dataNo motor approval
Shielded VFD cable specifiedCable construction helps EMC but not all dV/dt stressCable data sheetNo substitution approval

Use notes

  • Use this chart as a planning and conversation aid only.
  • Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
  • Use the linked calculator or table when the task needs project-specific arithmetic.

Reference sources

Open the underlying public references before treating the chart as project guidance.