EMS units are recommended for use with commercial power only

Joel_T wrote:

Easier said than done now that everything's in the front passthrough.

That is not proper use of Romex and I hope it is only a temporary setup for testing. Romex is meant to be hardwired in a manner that prevents flexing. Putting a plug on it and moving it occasionally should not be done. You should replace that Romex with flexible wiring.