CY is ok for drag chains but does suffer from breakage over time. I have replaced loads of the stuff over the years. Give it a good stretch before you install it and make sure it is firmly secured at both ends of the drag chain so that it doesnt pull itself into the drag chain and start to coil up with the repeated movement. Also be careful
about how you unwind the cable before installation. Roll it from the drum so that it doesnt twist.

Ian