Will 350kcm alluminum parralle runs work for 600amp service?

Yes, 350 kcmil aluminum conductors can be used for a 600 amp service, provided they are installed in accordance with the National Electrical Code (NEC) and local regulations. Typically, 350 kcmil aluminum conductors have an ampacity rating that can support 600 amps, depending on factors like ambient temperature and installation conditions. However, it's essential to consult the NEC tables and possibly a licensed electrician to ensure compliance with all applicable codes and safety standards.