I have a question for some one with electrical knowledge.....I just installed a tub which uses 4 wire...heres my problem....my neutral and ground bus bars are the same.....everyone I talk to says they need to be seperate....is there some way to add a neutra; buss to my service with out changing the complete service,,,,,thanks for any help, Joe

Joe, go to this website, I think it will become clearer to you.

http://spasupport.com/electrical/main/installguide.html