In earlier threads, I left out the voltage between two main lugs in subpanel....245V also. Since this is a mobile compressor usually used on new construction sites, I was a little baffled by the configuration in this new space I am leasing. It is in fact in an old warehouse which could explain the unusual wiring. In the shop I usually use a 6 ga, 4-wire pigtail with Hubbell 7700 series connectors since it is not hard wired. Thanks for everyone's input and suggestions.