Forgot to mention, its just the ground wire thats solid 6 awg. The conductors are stranded 2 awg thhn/thwn-2. I actually managed (with a lot swearing) to get the 6 awg solid into the same liquid tight conduit as 2 x 2 awg thhn/then stranded wires with the help of some pull string and cable...
I'm installing my FCSP and in my excitement, I mistakenly ordered a bare 6 awg wire for the ground wire. Is it okay to use this or should I get a coated ground wire when it enters the FCSP enclosure?