Howdy (my first post)!

I got a call from a guy that wants to know if I can run him a separate GEC wire to an old sub-panel (and then replace it with a new sub-panel so he can run new 110/220 grounded outlets from it).

The current panel is run off a 60A feed using old (but still good he claims) 6AWG SEU cable ran under the house. The existing sub-panel was (at one time) the main service for the house and has the old “shotgun shell” fuses with MAIN and RANGE lugs off it with 4 Edison fuses for everything else. The reason for not running all new cable is the expense (CU and AL are both obscenely priced now!!!) He can wait on this but I'm wondering if it can be done code complaint (and safe of course) with less expense. Code references appreciated.

Thanks.

P.S. I haven’t personally inspected this yet (and I will before I commit to it) but this guy is pretty savvy so I’ll bet his observations are pretty accurate.