Super Soft YK Series Cable. The latest new electric wire model has been developed for the production and distribution in Yazaki Electric Wire Co., Ltd., which is the company’s headquarters in Japan, since 2009. This new model is called Yawaraka Cable or Super Soft YK Series Cable. The Super Soft YK Series Cable is a low voltage power cable available in 4 types: YK 60227 IEC 01 THW, YK 60227 IEC 10, YK NYY, YK FD-0.6/1KV-CV