Catenary Design Calculator
Design overhead catenary system parameters: messenger wire sag, contact wire height, wind deflection, dropper count, and electrical clearances.
Inputs
ft
lbs
lbs
ft
mph
kV
Results
Messenger wire sag
21.3 in
≈ 6 credit cards
Messenger wire sag1.77 ft
Messenger height at support21.77 ft
System height at support3.77 ft
Wind deflection3.1 in
Deflection within limit1
Droppers per span12
Recommended pre-sag1.5 in
Min electrical clearance31 in
Span classification1
How to Use This Calculator
- Enter Span length, Messenger wire tension, and Contact wire tension.
- Set Contact wire height, Design wind speed, and System voltage.
- Review the Messenger wire sag (in) result.
- Use Messenger wire sag (ft) and Messenger height at support (ft) to inform your decision.
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