Conduit 90 Stub and Back-to-Back

Formula and source

Stub-up mark = desired height - bender deduct (take-up). Back-to-back: the far mark referenced from the near stub. Segmented 90: shot count n = ceil(90 / per-shot angle), arc per shot = radius * per-shot angle in radians.

Standard 90-degree stub-up deduct (take-up) and segment-bend geometry from the electrical apprenticeship and Ugly's Electrical References, by name. NEC Article 358 minimum radius and the four-quarter-bends-per-run limit govern.

Audience

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Posture

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