So we just got our new gun safe, and like all new gun safes it has that little hole in the lower corner in the back so you can pass an electrical cord through it to plug something into the wall like some lights or a dri-rod. My question is, it is currently covered by a rubber grommet on the inside and the outside, do you just remove these grommets and put the cord through? or do you slice the grommet so that the cord goes through and the grommet is still there.

I can literally find no information on this anywhere. If you just remove the grommets don't you lose your fire rating? and if the grommet is not there couldn't the cord rub on the metal and over time wouldn't that cause some issues if the cord lost all of its protective plastic?

thanks for any thoughts or links to where i can read up on this more.