How is the minimum bending radius determined for cables?

The cable bending radius is a measurement of the smallest radius a cable can be bent around without damaging the cable.

Cable Minimum Bend Radius

Factors which influence the minimum bending radius include the cable size, the cable construction, the conductor type and the sheathing and insulation types used.

The bending radius is normally expressed as a factor of the overall dimension of the cable for example, 6D or 6x the outer diameter of the cable.

Exceeding the cable bending radius

The relevant standards determine a minimum bending radius so as to protect the integrity and performance of the cable. Where the cable bending radius has been exceeded - whether through winding onto drums with a barrel diameter too small for the cable or during installation - the cable can show kinking or other sheath damage as an indication of other possible problems. Where it is suspected the cable bend radius has been exceeded it is recommended that testing, such as the sheath integrity test conducted by The Cable Lab, be undertaken prior to further install to determine if the cable performance has been impeded. 

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