So my friend has an old 8/2 SER cable that used to service an A/C which has been removed. She wants to install a hot tub and wants to know if I can reuse the circuit. Would it be safe to relocate the bare wire to the neutral bar (after wrapping the bare exposed wiring with white phase tape) to supply a neutral to the spa panel? I could then drive a ground rod within 6 feet of the GFCI spa panel to supply the earth ground. Would this be considered safe? This is my first time dealing with/thinking about a situation like this... Thanks.