Cable Installation
Sidewall Pressure
Check bend pressure against the cable manufacturer limit.
Engineering basisConduit bend pressureSingle and three-cable arrangementsManufacturer limits
FORMULAS USED
Single cable / common jacket
SP = T/RThree single-core cables, cradled
SP = (3*w-2)*T/(3*R)Three single-core cables, triangular
SP = w*T/(2*R)Radius required by pressure limit
R_required = pressure*R/limitT: total tension leaving the bend, N. R: effective bend radius, m. w: weight correction factor. SP: sidewall pressure, N/m.
Engineering References
Southwire Power Cable Installation Guide
E-20 to E-22: single/common-jacket, three cradled, three triangular. Geometry and weight factors: Figure F-13 and E-16 to E-18.
SourceProject cable manufacturer limit
Enter the documented limit for the actual cable. No universal pressure limit is preselected. This pressure check does not establish pulling-tension, fill, jamming or bending-radius compliance.
Source