Good point, Here’s Martin’s post from this thread
I bet most gas appliances will explicitly spell it out so Ill try and find manufacturer’s documentation if I ever encounter this again.
I happened to find an AC low voltage wire recently that was strained against an unprotected opening and was starting to get damaged… part of me didn’t actually believe that happens until I saw it!
I find it hard to believe the vibration could cut through foam insulation and the metal flex connector, but I guess there is some chance that the insulation/grommet get displaced after installation… maybe some manufacturers do recommend against that?