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Adjust span length, temperature, conductor, and primary voltage. Toggle between GO-95 and NESC to see how code-required ground clearances change with voltage class. Drag the colored sliders on each pole to set attachment heights for primary, secondary, and comm circuits.

Span length

350 ft

Temperature

75°F

Clearance standard

GO-95 Table 1, Case 4

Primary voltage (L-L)

Affects primary clearance & Pri↔Sec sep

Primary conductor Secondary conductor Comm cable

Pole A

PRI 38

SEC 30

COM 24

Pole B

PRI 36

SEC 28

COM 22

Primary to gnd

— ft

—

Secondary to gnd

— ft

—

Comm to gnd

— ft

—

Pri ↔ Sec

— ft

—

Sec ↔ Com

— ft

—

Primary Secondary Comm Terrain ribbon Ground / wire-to-wire clearance indicators

How this works: Parabolic sag approximation D = wL²/(8H) where H ≈ 33% RBS, scaling ±0.15%/°F from 60°F reference. Secondary fixed at 1/0 AAC triplex (0.35 lb/ft); comm fixed at aerial fiber (0.12 lb/ft). GO-95 Table 1, Case 4 (roads, streets, alleys): secondary 18 ft, comm 18 ft, primary 20 ft for <22.9 kV L-L / 22 ft for 22.9–50 kV / 24 ft above 50 kV. NESC Table 232-1, Case C (roads used by vehicle traffic): ≤750 V and comm 18 ft; 750 V–22 kV = 20 ft; 22–50 kV = 22 ft; above 50 kV adds 0.4 in/kV. Pri↔Sec vertical separation — GO-95 Rule 38.1: 40 in ≤22.9 kV · 60 in 22.9–50 kV · 84 in >50 kV. NESC Rule 235: 40 in ≤22 kV · 48 in 22–50 kV · 60 in >50 kV. Sec↔Com fixed at 40 in (3.33 ft) in both codes (both low-class/comm conductors). The platform's Sag API runs this against a full catenary solver with real terrain elevation data.