Why does my cat keep chewing electric wires?

Petcords is referenced in this article in the UK as quoted in the article:

It is important to solve this as soon as possible as there is a real danger of electrocution or severe mouth burns.

Chewing is very common in kittens and is associated with teething.

In older cats it may be due to oral discomfort and they may get some relief by chewing.

https://www.express.co.uk/news/nature/860322/why-does-my-cat-chew-wires