NOPE.Recently our local AHJ has decided the use of Myers type hubs and the Factory supplied hub on the top of panels and metering devices are only listed for GRC or IMC. In addition, we are being informed any field penetrations into the top of any rain tight enclosure is also in violation of the listing for the enclosures.
For my entire career in the electrical industry (+27 years) it has been common practice to install a listed rain tight EMT connector or PVC terminal adapter into these hubs then install EMT or PVC in-lieu-of GRC or IMC where the installation allows for the conduit type. Additionally, it has also been common practice to knock out an opening, install a threaded rain tight hub and exit the enclosure through the top with which ever raceway method you choose assuming it is installed per the NEC.
Installing GRC or IMC in some instances will almost be impossible for the type of work we do. I would like to hear others thoughts, ideas, and or suggestions. Product manufacturers are definitely encouraged to give me your feedback and suggestions.
Install a nipple. Then transition to PVC -- if that's what's best.
He's busting your %$#@ over the fact that a Meyers hub is listed for GRC/IMC compression threads.
As for the rest, it sounds like the AHJ does not know his business.
All across America, top side penetrations are common as dust.
BTW, this very topic has been recently beaten to death at ET.
Scroll through the back threads. You won't have to go far.