How about denofeng insulation strip?

It's good.

Anhui Denuo Technology Co., Ltd. was established on 20 12, focusing on the research and development of low-voltage power line communication technology below 380V and its wide application in the field of Internet of Things; The company's main products are power carrier communication chips, modules and Internet of Things terminal application products and systems. It is a high-tech and specialized enterprise integrating design, R&D and production, a gazelle enterprise in high-tech zone and a big data enterprise in Hefei.