DSL Busbar Voltage Drop Calculator

Estimate whether a proposed EOT crane DSL/busbar rating and feed arrangement may create excessive voltage drop for one crane or multiple cranes sharing the same bay.

Enter DSL Details

Use vendor data where available. If not available, use this as a first-pass estimate before asking the vendor to confirm the exact design.

Volts, 3-phase system

Total busbar length in meters

Center, dual, or multiple feeds reduce the longest current path

Used when individual currents below are blank

Cranes sharing the same DSL/bay

Optional. Enter different crane currents in amps, separated by commas. When filled, this overrides current per crane and number of cranes.

Use 1.0 for worst case, 0.7 when not all cranes run at full load together

Adds buyer-side allowance before comparing busbar rating

Used only when multiple feed points is selected

Use the offered DSL/busbar rating

Percent limit for warning

When to Worry

  • Long runway with only one end feed.
  • Two or more cranes sharing one DSL with end feed only.
  • High current cranes on low-rated busbar.
  • VFD trips or contactor chatter near far end.
  • Vendor cannot explain voltage drop basis.

How to Improve

  • Increase busbar current rating or conductor size.
  • Use center feed or additional feed points.
  • Reduce joint resistance with better installation.
  • Confirm actual conductor data with the supplier.

Next Step

Use this result while comparing quotations and ask vendors to confirm their calculation, BOM, and feed arrangement.

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Related DSL / Busbar Guides

Current Rating Voltage Drop Guide Multiple Cranes Collector Shoes