Cable Bend Radius Minimum
Minimum inside bend radius as a multiple of cable OD per manufacturer bulletins.
Example
You enter
- Cable type THHN
- Cable OD (in) 0.5
You get
- Multiple 8x OD
- Minimum inside bend radius 4 in
Details, formula, and sources
Min bend radius = multiplier × cable OD; multipliers per cable type (THHN/XHHW 8x, MC 7x, control 6x, coax 10x, fiber 20x).
Manufacturer minimums (Southwire, AFC, Belden, Corning); NEC 300.34 by name.
Free read-only access at nfpa.org/freeaccess. Manufacturer guides free at each manufacturer site.
Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.
Field names used by the API: cable_type, cable_od_in, multiple, min_radius_in
- Multiplier table data/electrical/cable-bend-radius.jsonmanufacturer-attributed per row