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Model: Fill ratio = Σ(cable OD²) ÷ duct ID² — keep ≤ 40% for pullable installs (some codes allow only 31% for exactly two cables). TIA-598 colour order: blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, aqua (tubes and strands alike).
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For planning guidance only. Results are computed from the stated model and assumptions — verify against your own design standards before use. · Privacy note