There is a good picture of what my panel will look like at https://www.ecmweb.com/qampa/stumped-code-2
I don't want to copy their picture over here so I'll describe the situation: I'm adding electric service to my pole barn. The inspector has said that since I have unfinished walls I should sleeve cables below 8' for protection. The electric code allows for this but one of the rules is that the sleeve for the panel is to be sealed. I don't see any specific products for sealing conduit with NM cables in it so I wonder if I'm supposed to run all cables and then squirt a bunch of expanding foam into the top of the pipe? That seems messy so I assume that there is something better.
Is there a proper way to seal this protective sleeve with the NM in it?