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14 sty 2022 · Below you will find the best resources on bending radius for wire and cable, including an easy-to-use chart for figuring out your minimum bend radius per the NEC and ICEA, and a step-by-step calculator/guide for making this determination for your current or upcoming project.
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Minimum Bending Radius (Dynamic Conditions) The following formula can be used to determine the minimum values for the radii to which such cables may be bent while being pulled into an installation and while under tension.
Larger bend radii shall be considered for conduit bends, sheaves, or other curved surfaces around which the cable may be pulled under tension while being installed, due to sidewall bearing pressure limits of the cable. An unshielded cable can tolerate a sharper bend than a shielded cable.
Table 2 gives typical values of the low sidewall bearing pressure dynamic coefficient of friction with properly applied pulling lubricant. The actual values may be obtained from the lubricant
Learn what minimum bend radius is and why it is critical during cable installation and review examples of bend radius calculations in this Wire Wisdom.
NATIONAL WIRE & CABLE custom cable manufacturing & molding • www.nationalwire.com Order Desk 323-225-5611 7-2 CABLE DESIGNERS GUIDE HOW TO SPECIFY CABLE In the absence of your own cable specification, the following checklist will assist you to completely specify the cable you want: A. Number and gauge of conductors.
If a smaller wire gage is used, the listed values should be adjusted accordingly. Wire shall not be pulled to a force in excess of 80 percent of the specified minimum crimp tensile requirement. This requirement must be met to avoid damage to the wire / contact crimp joint.