Romex bundling

Pictorial example of why bundling large groups of romexes for a good distance can be bad:

Was it the amount of connected electricity that caused it??

No. Heat causes what you’re looking at.



Great pic and example, thanx

I believe they should be derated when bundled over long distances. In the past, there were a couple of good threads on the subject over at In fact, I think one is ongoing currently.