There are outstanding physical differences between quality curly cord and defective curly cord. A quality curly cord is very excellent performance at the resilience strength and flex reliability, while a defective curly cord fails to comply with either of the aspects.
There are a few important factors of considering a good quality curly cord.
- the resilience force
- the flex life
- the appearance
- safety mark
- application compliance
A good quality raw straight cable contributes to a perfect artwork of curly cord. Therefore, different kinds of safety approvals appear to be applied on the curly cord. The most popular approval for curly cord is UL approval. There are many different style numbers generated under the UL approval, such as UL20549, UL20280, etc.