O-calc Pro Line Design May 2026

Mastering the Grid: A Deep Dive into O-Calc Pro Line Design for Modern Utility Engineering

Creep and Relaxation Modeling

1. New Project → Name “Main St Rebuild”
2. Add Poles → Pole 1 (40ft wood), Pole 2 (40ft wood), Span = 250ft
3. Add Conductor → 477 ACSR, 25% RTS initial tension
4. Run Sag → Accept default temps
5. Add Attachments → 50kVA xfmr @ 20ft on Pole 1
6. Load Cases → NESC Heavy + Extreme Wind (90mph)
7. Analyze → Review pole utilizations (<100% passes)
8. Generate Report → PDF stringing table + clearance diagram

2. Conductor Sag & Tension (Stringing Charts)