O-calc Pro Line Design
For multi-conductor bundles (e.g., two conductors per phase on 345 kV lines), O-calc Pro can simulate one sub-conductor breaking. The software calculates:
This is critical for designing line armor rods and structural resilience. O-calc Pro Line Design
| Feature | O-calc Pro Line Design | PLS-CADD | Sag10 (freeware) | | --- | --- | --- | --- | | Ease of learning | Moderate (1-2 days) | Steep (2-4 weeks) | Low (no GUI for terrain) | | Cost | Mid-range subscription | High ($15k+ per seat) | Free (limited support) | | Terrain import | Yes (LiDAR, shapefile) | Yes (advanced) | No | | Broken wire analysis | Yes | Yes | No | | NESC compliance tables | Yes | User-coded | Manual only | | Auto-structure spotting | Yes | Yes (add-on) | No | | Support & updates | Excellent | Good | None | For multi-conductor bundles (e
For most distribution and sub-transmission utilities (69 kV and below), O-calc Pro hits the sweet spot of power and usability. For extra-high voltage (345 kV+), PLS-CADD remains the gold standard, but O-calc Pro is rapidly closing the gap. This is critical for designing line armor rods
Critical: For long spans or steep terrain, use Grade & Drift tool to adjust sag for wind and slope.
O-Calc Pro is widely considered the industry standard for overhead electric utility structural analysis. Developed by chance encounters (and later acquired by Bentley Systems), it fills a specific niche: the detailed, physics-based analysis of wood, steel, and concrete poles under the strain of conductor loading.
Unlike general-purpose CAD tools (like AutoCAD), O-Calc is a calculation engine first and a visualization tool second. It is highly specialized for utility engineers who need to ensure compliance with NESC, GO 95, or CSA standards.