Panel Change outs

[kwired]

I know it's not the same thing but I had a box of space saver EMT connectors once. I think it was a promotional thing.

View attachment 2581103

Those would be great for when adding a raceway between two already fixed enclosures. I never seen that particular type but have used some that are a compression nut type.

 

[kwired]

The idea is sparks and molten copper can happen in a panel and be pushed out of holes by air pressure and or rodents / dust or flammable materials can enter surprisingly small holes.

Thing is those all can pass through many listed NM cable fittings as well, or many boxes or cabinets do have other small holes in them that are not required to be sealed as well.